fix(material/checkbox): remove deprecated factory functions

Removes factory functions that we had marked as deprecated for v21. These functions aren't necessary since we switched to standalone.

BREAKING CHANGE:
* `MAT_CHECKBOX_DEFAULT_OPTIONS_FACTORY` has been removed.

Author: crisbeto

goldens/material/checkbox/index.api.md

@@ -21,9 +21,6 @@ import { Validator } from '@angular/forms';
 // @public
 export const MAT_CHECKBOX_DEFAULT_OPTIONS: InjectionToken<MatCheckboxDefaultOptions>;
 
-// @public @deprecated
-export function MAT_CHECKBOX_DEFAULT_OPTIONS_FACTORY(): MatCheckboxDefaultOptions;
-
 // @public (undocumented)
 export class MatCheckbox implements AfterViewInit, OnChanges, ControlValueAccessor, Validator, FocusableOption {
     constructor(...args: unknown[]);

src/material/checkbox/checkbox-config.ts

@@ -26,28 +26,21 @@ export interface MatCheckboxDefaultOptions {
   disabledInteractive?: boolean;
 }
 
+export const checkboxDefaults: MatCheckboxDefaultOptions = {
+  color: 'accent',
+  clickAction: 'check-indeterminate',
+  disabledInteractive: false,
+};
+
 /** Injection token to be used to override the default options for `mat-checkbox`. */
 export const MAT_CHECKBOX_DEFAULT_OPTIONS = new InjectionToken<MatCheckboxDefaultOptions>(
   'mat-checkbox-default-options',
   {
     providedIn: 'root',
-    factory: MAT_CHECKBOX_DEFAULT_OPTIONS_FACTORY,
+    factory: () => checkboxDefaults,
   },
 );
 
-/**
- * @docs-private
- * @deprecated No longer used, will be removed.
- * @breaking-change 21.0.0
- */
-export function MAT_CHECKBOX_DEFAULT_OPTIONS_FACTORY(): MatCheckboxDefaultOptions {
-  return {
-    color: 'accent',
-    clickAction: 'check-indeterminate',
-    disabledInteractive: false,
-  };
-}
-
 /**
  * Checkbox click action when user click on input element.
  * noop: Do not toggle checked or indeterminate.

src/material/checkbox/checkbox.ts

@@ -43,8 +43,8 @@ import {
   _animationsDisabled,
 } from '../core';
 import {
+  checkboxDefaults,
   MAT_CHECKBOX_DEFAULT_OPTIONS,
-  MAT_CHECKBOX_DEFAULT_OPTIONS_FACTORY,
   MatCheckboxDefaultOptions,
 } from './checkbox-config';
 import {_CdkPrivateStyleLoader} from '@angular/cdk/private';
@@ -72,9 +72,6 @@ export class MatCheckboxChange {
   checked: boolean;
 }
 
-// Default checkbox configuration.
-const defaults = MAT_CHECKBOX_DEFAULT_OPTIONS_FACTORY();
-
 @Component({
   selector: 'mat-checkbox',
   templateUrl: 'checkbox.html',
@@ -248,8 +245,8 @@ export class MatCheckbox
   constructor() {
     inject(_CdkPrivateStyleLoader).load(_StructuralStylesLoader);
     const tabIndex = inject(new HostAttributeToken('tabindex'), {optional: true});
-    this._options = this._options || defaults;
-    this.color = this._options.color || defaults.color;
+    this._options = this._options || checkboxDefaults;
+    this.color = this._options.color || checkboxDefaults.color;
     this.tabIndex = tabIndex == null ? 0 : parseInt(tabIndex) || 0;
     this.id = this._uniqueId = inject(_IdGenerator).getId('mat-mdc-checkbox-');
     this.disabledInteractive = this._options?.disabledInteractive ?? false;

src/material/checkbox/public-api.ts

@@ -7,5 +7,9 @@
  */
 
 export * from './checkbox';
-export * from './checkbox-config';
+export {
+  MatCheckboxDefaultOptions,
+  MAT_CHECKBOX_DEFAULT_OPTIONS,
+  MatCheckboxClickAction,
+} from './checkbox-config';
 export * from './checkbox-module';