fix linting

Author: Caleb Kish

src/material/timepicker/timepicker-input.ts

@@ -41,7 +41,6 @@ import {MAT_INPUT_VALUE_ACCESSOR} from '../input';
 import {Subscription} from 'rxjs';
 import {DOWN_ARROW, ESCAPE, hasModifierKey, UP_ARROW} from '@angular/cdk/keycodes';
 import {validateAdapter} from './util';
-import {DOCUMENT} from '@angular/common';
 import {_getFocusedElementPierceShadowDom} from '@angular/cdk/platform';
 
 /**
@@ -83,7 +82,6 @@ import {_getFocusedElementPierceShadowDom} from '@angular/cdk/platform';
 })
 export class MatTimepickerInput<D> implements ControlValueAccessor, Validator, OnDestroy {
   private _elementRef = inject<ElementRef<HTMLInputElement>>(ElementRef);
-  private _document = inject(DOCUMENT);
   private _dateAdapter = inject<DateAdapter<D>>(DateAdapter, {optional: true})!;
   private _dateFormats = inject(MAT_DATE_FORMATS, {optional: true})!;
   private _formField = inject(MAT_FORM_FIELD, {optional: true});