refactor(material/expansion): remove incorrect inputs overrides

The bases classes of the CDK already define the input with transforms.
Technically the new `inputs` declarations override the full metadata,
loosing the transforms. This is currently a bug in the framework
where components relied on the behavior that transforms were
inherited independently. This commit fixes this and cleans up the
code. The inputs do not need to be re-declared.

src/material/expansion/accordion.ts

@@ -32,7 +32,6 @@ import {MatExpansionPanelHeader} from './expansion-panel-header';
 @Directive({
   selector: 'mat-accordion',
   exportAs: 'matAccordion',
-  inputs: ['multi'],
   providers: [
     {
       provide: MAT_ACCORDION,

src/material/expansion/expansion-panel.ts

@@ -81,8 +81,6 @@ export const MAT_EXPANSION_PANEL_DEFAULT_OPTIONS =
   templateUrl: 'expansion-panel.html',
   encapsulation: ViewEncapsulation.None,
   changeDetection: ChangeDetectionStrategy.OnPush,
-  inputs: ['disabled', 'expanded'],
-  outputs: ['opened', 'closed', 'expandedChange'],
   animations: [matExpansionAnimations.bodyExpansion],
   providers: [
     // Provide MatAccordion as undefined to prevent nested expansion panels from registering

tools/public_api_guard/material/expansion.md

@@ -59,7 +59,7 @@ export class MatAccordion extends CdkAccordion implements MatAccordionBase, Afte
     ngOnDestroy(): void;
     togglePosition: MatAccordionTogglePosition;
     // (undocumented)
-    static ɵdir: i0.ɵɵDirectiveDeclaration<MatAccordion, "mat-accordion", ["matAccordion"], { "multi": { "alias": "multi"; "required": false; }; "hideToggle": { "alias": "hideToggle"; "required": false; }; "displayMode": { "alias": "displayMode"; "required": false; }; "togglePosition": { "alias": "togglePosition"; "required": false; }; }, {}, ["_headers"], never, true, never>;
+    static ɵdir: i0.ɵɵDirectiveDeclaration<MatAccordion, "mat-accordion", ["matAccordion"], { "hideToggle": { "alias": "hideToggle"; "required": false; }; "displayMode": { "alias": "displayMode"; "required": false; }; "togglePosition": { "alias": "togglePosition"; "required": false; }; }, {}, ["_headers"], never, true, never>;
     // (undocumented)
     static ɵfac: i0.ɵɵFactoryDeclaration<MatAccordion, never>;
 }
@@ -128,7 +128,7 @@ export class MatExpansionPanel extends CdkAccordionItem implements AfterContentI
     get togglePosition(): MatAccordionTogglePosition;
     set togglePosition(value: MatAccordionTogglePosition);
     // (undocumented)
-    static ɵcmp: i0.ɵɵComponentDeclaration<MatExpansionPanel, "mat-expansion-panel", ["matExpansionPanel"], { "disabled": { "alias": "disabled"; "required": false; }; "expanded": { "alias": "expanded"; "required": false; }; "hideToggle": { "alias": "hideToggle"; "required": false; }; "togglePosition": { "alias": "togglePosition"; "required": false; }; }, { "opened": "opened"; "closed": "closed"; "expandedChange": "expandedChange"; "afterExpand": "afterExpand"; "afterCollapse": "afterCollapse"; }, ["_lazyContent"], ["mat-expansion-panel-header", "*", "mat-action-row"], true, never>;
+    static ɵcmp: i0.ɵɵComponentDeclaration<MatExpansionPanel, "mat-expansion-panel", ["matExpansionPanel"], { "hideToggle": { "alias": "hideToggle"; "required": false; }; "togglePosition": { "alias": "togglePosition"; "required": false; }; }, { "afterExpand": "afterExpand"; "afterCollapse": "afterCollapse"; }, ["_lazyContent"], ["mat-expansion-panel-header", "*", "mat-action-row"], true, never>;
     // (undocumented)
     static ɵfac: i0.ɵɵFactoryDeclaration<MatExpansionPanel, [{ optional: true; skipSelf: true; }, null, null, null, null, { optional: true; }, { optional: true; }]>;
 }