fix(combobox): fixed formatting lint errors.

Author: nielsr98

src/cdk-experimental/combobox/combobox.ts

@@ -67,7 +67,8 @@ export class CdkCombobox<T = unknown> implements OnDestroy, AfterContentInit {
 
   @Output('comboboxPanelOpened') readonly opened: EventEmitter<void> = new EventEmitter<void>();
   @Output('comboboxPanelClosed') readonly closed: EventEmitter<void> = new EventEmitter<void>();
-  @Output('panelValueChanged') readonly panelValueChanged: EventEmitter<T | T[]> = new EventEmitter<T | T[]>();
+  @Output('panelValueChanged')
+    readonly panelValueChanged: EventEmitter<T | T[]> = new EventEmitter<T | T[]>();
 
   private _overlayRef: OverlayRef;
   private _panelContent: TemplatePortal;

src/cdk-experimental/listbox/listbox.spec.ts

@@ -16,7 +16,7 @@ import {
 } from '@angular/cdk/testing/private';
 import {A, DOWN_ARROW, END, HOME, SPACE} from '@angular/cdk/keycodes';
 import {FormControl, FormsModule, ReactiveFormsModule} from '@angular/forms';
-import {CdkCombobox, CdkComboboxModule} from "@angular/cdk-experimental/combobox";
+import {CdkCombobox, CdkComboboxModule} from '@angular/cdk-experimental/combobox';
 
 
 describe('CdkOption and CdkListbox', () => {

src/cdk-experimental/listbox/listbox.ts

@@ -22,7 +22,7 @@ import {SelectionChange, SelectionModel} from '@angular/cdk/collections';
 import {defer, merge, Observable, Subject} from 'rxjs';
 import {startWith, switchMap, takeUntil} from 'rxjs/operators';
 import {ControlValueAccessor, NG_VALUE_ACCESSOR} from '@angular/forms';
-import {CdkComboboxPanel} from "@angular/cdk-experimental/combobox";
+import {CdkComboboxPanel} from '@angular/cdk-experimental/combobox';
 
 let nextId = 0;
 let listboxId = 0;
@@ -283,7 +283,7 @@ export class CdkListbox<T> implements AfterContentInit, OnDestroy, OnInit, Contr
   ngAfterContentInit() {
     this._initKeyManager();
     this._initSelectionModel();
-    this.registerWithPanel();
+    this._registerWithPanel();
 
     this.optionSelectionChanges.subscribe(event => {
       this._updateSelectionModel(event.source);
@@ -299,7 +299,7 @@ export class CdkListbox<T> implements AfterContentInit, OnDestroy, OnInit, Contr
     this._destroyed.complete();
   }
 
-  private registerWithPanel(): void {
+  private _registerWithPanel(): void {
     if (this._parentPanel === null || this._parentPanel === undefined) {
       if (this._explicitPanel !== null && this._explicitPanel !== undefined) {
         this._explicitPanel._registerContent(this.id, 'listbox');
@@ -391,7 +391,8 @@ export class CdkListbox<T> implements AfterContentInit, OnDestroy, OnInit, Contr
           this._explicitPanel.closePanel(data);
         }
       } else {
-        option.selected ? this._parentPanel.closePanel(option.value) : this._parentPanel.closePanel();
+        option.selected ?
+          this._parentPanel.closePanel(option.value) : this._parentPanel.closePanel();
       }
     }
   }