ng update @angular/cli does't convert baseHref

[MiroslavKral]

Versions

Angular CLI: 6.0.1
Node: 8.11.1
OS: win32 x64
Angular:
...

Package                      Version
------------------------------------------------------
@angular-devkit/architect    0.6.1
@angular-devkit/core         0.6.1
@angular-devkit/schematics   0.6.1
@schematics/angular          0.6.1
@schematics/update           0.6.1
rxjs                         6.1.0
typescript                   2.7.2

Repro steps

Original .angular-cli.json

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "project": {
    "name": "test-app"
  },
  "apps": [
    {
      "baseHref": "/test/",
      "root": "src",
      "outDir": "src/main/webapp",
      "assets": [
        "favicon.ico",
        {
          "glob": "**/*",
          "input": "../assets/fonts",
          "output": "./assets/fonts"
        },
        {
          "glob": "**/*",
          "input": "../assets/images",
          "output": "./assets/images"
        }
      ],
      "index": "index.html",
      "main": "main.ts",
      "polyfills": "polyfills.ts",
      "test": "test.ts",
      "tsconfig": "tsconfig.app.json",
      "testTsconfig": "tsconfig.spec.json",
      "prefix": "rb",
      "styles": [
        "../node_modules/ionicons/css/ionicons.css",
        "styles.styl"
      ],
      "scripts": [
        "external/encrypt.js"
      ],
      "environmentSource": "environments/environment.ts",
      "environments": {
        "dev": "environments/environment.ts",
        "prod": "environments/environment.prod.ts"
      }
    }
  ],
  "e2e": {
    "protractor": {
      "config": "./protractor.conf.js"
    }
  },
  "lint": [
    {
      "project": "src/tsconfig.app.json",
      "exclude": "**/node_modules/**"
    },
    {
      "project": "src/tsconfig.spec.json",
      "exclude": "**/node_modules/**"
    },
    {
      "project": "e2e/tsconfig.e2e.json",
      "exclude": "**/node_modules/**"
    }
  ],
  "test": {
    "karma": {
      "config": "./karma.conf.js"
    }
  },
  "defaults": {
    "styleExt": "styl",
    "component": {}
  }
}

angular.json after ng update @angular/cli:

{
  "$schema": "./node_modules/@angular/cli/lib/config/schema.json",
  "version": 1,
  "newProjectRoot": "projects",
  "projects": {
    "test-app": {
      "root": "",
      "sourceRoot": "src",
      "projectType": "application",
      "architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "src/main/webapp",
            "index": "src/index.html",
            "main": "src/main.ts",
            "tsConfig": "src/tsconfig.app.json",
            "polyfills": "src/polyfills.ts",
            "assets": [
              "src/favicon.ico",
              {
                "glob": "**/*",
                "input": "assets/fonts",
                "output": "/assets/fonts"
              },
              {
                "glob": "**/*",
                "input": "assets/images",
                "output": "/assets/images"
              }
            ],
            "styles": [
              "node_modules/ionicons/css/ionicons.css",
              "src/styles.styl"
            ],
            "scripts": [
              "src/external/encrypt.js"
            ]
          },
          "configurations": {
            "production": {
              "optimization": true,
              "outputHashing": "all",
              "sourceMap": false,
              "extractCss": true,
              "namedChunks": false,
              "aot": true,
              "extractLicenses": true,
              "vendorChunk": false,
              "buildOptimizer": true,
              "fileReplacements": [
                {
                  "replace": "src/environments/environment.ts",
                  "with": "src/environments/environment.prod.ts"
                }
              ]
            }
          }
        },
        "serve": {
          "builder": "@angular-devkit/build-angular:dev-server",
          "options": {
            "browserTarget": "test-app:build"
          },
          "configurations": {
            "production": {
              "browserTarget": "test-app:build:production"
            }
          }
        },
        "extract-i18n": {
          "builder": "@angular-devkit/build-angular:extract-i18n",
          "options": {
            "browserTarget": "test-app:build"
          }
        },
        "test": {
          "builder": "@angular-devkit/build-angular:karma",
          "options": {
            "main": "src/test.ts",
            "karmaConfig": "./karma.conf.js",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "src/tsconfig.spec.json",
            "scripts": [
              "src/external/encrypt.js"
            ],
            "styles": [
              "node_modules/ionicons/css/ionicons.css",
              "src/styles.styl"
            ],
            "assets": [
              "src/favicon.ico",
              {
                "glob": "**/*",
                "input": "assets/fonts",
                "output": "/assets/fonts"
              },
              {
                "glob": "**/*",
                "input": "assets/images",
                "output": "/assets/images"
              }
            ]
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "src/tsconfig.app.json",
              "src/tsconfig.spec.json"
            ],
            "exclude": [
              "**/node_modules/**"
            ]
          }
        }
      }
    },
    "test-app-e2e": {
      "root": "",
      "sourceRoot": "",
      "projectType": "application",
      "architect": {
        "e2e": {
          "builder": "@angular-devkit/build-angular:protractor",
          "options": {
            "protractorConfig": "./protractor.conf.js",
            "devServerTarget": "test-app:serve"
          }
        },
        "lint": {
          "builder": "@angular-devkit/build-angular:tslint",
          "options": {
            "tsConfig": [
              "e2e/tsconfig.e2e.json"
            ],
            "exclude": [
              "**/node_modules/**"
            ]
          }
        }
      }
    }
  },
  "defaultProject": "test-app",
  "schematics": {
    "@schematics/angular:component": {
      "prefix": "rb",
      "styleext": "styl"
    },
    "@schematics/angular:directive": {
      "prefix": "rb"
    }
  }
}

Observed behavior

baseHref is not in new angular.json.

Desired behavior

baseHref should be converted in new angular.json

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