Update input_validation.ts

Author: schmidt-sebastian

packages/firestore/src/util/input_validation.ts

@@ -20,7 +20,6 @@ import { fail } from './assert';
 import { Code, FirestoreError } from './error';
 import { DocumentKey } from '../model/document_key';
 import { ResourcePath } from '../model/path';
-import { Compat } from '../compat/compat';
 
 /** Types accepted by validateType() and related methods for validation. */
 export type ValidationType =