fix(material/expansion): remove deprecated animation definitions

Deletes publicly-exported animation definitions that were marked for removal in v21.

BREAKING CHANGE:
* `EXPANSION_PANEL_ANIMATION_TIMING` symbol has been removed.
* `matExpansionAnimations` symbol has been removed.

Author: crisbeto

goldens/material/expansion/index.api.md

@@ -25,9 +25,6 @@ import { Subject } from 'rxjs';
 import { TemplatePortal } from '@angular/cdk/portal';
 import { TemplateRef } from '@angular/core';
 
-// @public @deprecated
-export const EXPANSION_PANEL_ANIMATION_TIMING = "225ms cubic-bezier(0.4,0.0,0.2,1)";
-
 // @public
 export const MAT_ACCORDION: InjectionToken<MatAccordionBase>;
 
@@ -73,12 +70,6 @@ export type MatAccordionDisplayMode = 'default' | 'flat';
 // @public
 export type MatAccordionTogglePosition = 'before' | 'after';
 
-// @public @deprecated
-export const matExpansionAnimations: {
-    readonly indicatorRotate: any;
-    readonly bodyExpansion: any;
-};
-
 // @public (undocumented)
 export class MatExpansionModule {
     // (undocumented)

src/material/expansion/BUILD.bazel

@@ -84,7 +84,6 @@ ng_project(
     srcs = [
         "accordion.ts",
         "accordion-base.ts",
-        "expansion-animations.ts",
         "expansion-module.ts",
         "expansion-panel.ts",
         "expansion-panel-base.ts",

src/material/expansion/expansion-animations.ts

@@ -12,5 +12,4 @@ export * from './accordion-base';
 export * from './expansion-panel';
 export * from './expansion-panel-header';
 export * from './expansion-panel-content';
-export * from './expansion-animations';
 export {MAT_EXPANSION_PANEL} from './expansion-panel-base';