refactor(list): remove 6.0.0 deletion targets (#10398)

Removes the 6.0.0 deletion targets from `material/list`.

BREAKING CHANGES:
* `selectionChange` on the `MatListOption`, which was deprecated in 5.0.0 has been removed. Use `selectionChange` on the `MatSelectionList` instead.
* `MatListOptionChange` which was deprecated in 5.0.0 has been removed.

src/lib/list/selection-list.spec.ts

@@ -11,7 +11,6 @@ import {By} from '@angular/platform-browser';
 import {
   MatListModule,
   MatListOption,
-  MatListOptionChange,
   MatSelectionList,
   MatSelectionListChange
 } from './index';
@@ -91,22 +90,6 @@ describe('MatSelectionList without forms', () => {
       expect(fixture.componentInstance.onValueChange).toHaveBeenCalledTimes(1);
     });
 
-    it('should emit a deprecated selectionChange event on the list option that got clicked', () => {
-      const optionInstance = listOptions[2].componentInstance as MatListOption;
-      let lastChangeEvent: MatListOptionChange | null = null;
-
-      optionInstance.selectionChange.subscribe(ev => lastChangeEvent = ev);
-
-      expect(lastChangeEvent).toBeNull();
-
-      dispatchFakeEvent(listOptions[2].nativeElement, 'click');
-      fixture.detectChanges();
-
-      expect(lastChangeEvent).not.toBeNull();
-      expect(lastChangeEvent!.source).toBe(optionInstance);
-      expect(lastChangeEvent!.selected).toBe(true);
-    });
-
     it('should be able to dispatch one selected item', () => {
       let testListItem = listOptions[2].injector.get<MatListOption>(MatListOption);
       let selectList =

src/lib/list/selection-list.ts

@@ -56,19 +56,6 @@ export const MAT_SELECTION_LIST_VALUE_ACCESSOR: any = {
   multi: true
 };
 
-/**
- * Change event object emitted by MatListOption whenever the selected state changes.
- * @deprecated Use the `MatSelectionListChange` event on the selection list instead.
- * @deletion-target 6.0.0
- */
-export class MatListOptionChange {
-  constructor(
-    /** Reference to the list option that changed. */
-    public source: MatListOption,
-    /** The new selected state of the option. */
-    public selected: boolean) {}
-}
-
 /** Change event that is being fired whenever the selected state of an option changes. */
 export class MatSelectionListChange {
   constructor(
@@ -148,14 +135,6 @@ export class MatListOption extends _MatListOptionMixinBase
     }
   }
 
-  /**
-   * Emits a change event whenever the selected state of an option changes.
-   * @deprecated Use the `selectionChange` event on the `<mat-selection-list>` instead.
-   * @deletion-target 6.0.0
-   */
-  @Output() readonly selectionChange: EventEmitter<MatListOptionChange> =
-    new EventEmitter<MatListOptionChange>();
-
   constructor(private _element: ElementRef,
               private _changeDetector: ChangeDetectorRef,
               /** @docs-private */
@@ -224,9 +203,6 @@ export class MatListOption extends _MatListOptionMixinBase
 
       // Emit a change event if the selected state of the option changed through user interaction.
       this.selectionList._emitChangeEvent(this);
-
-      // TODO: the `selectionChange` event on the option is deprecated. Remove that in the future.
-      this._emitDeprecatedChangeEvent();
     }
   }
 
@@ -261,12 +237,6 @@ export class MatListOption extends _MatListOptionMixinBase
 
     this._changeDetector.markForCheck();
   }
-
-  /** Emits a selectionChange event for this option. */
-  _emitDeprecatedChangeEvent() {
-    // TODO: the `selectionChange` event on the option is deprecated. Remove that in the future.
-    this.selectionChange.emit(new MatListOptionChange(this, this.selected));
-  }
 }
 
 
@@ -492,9 +462,6 @@ export class MatSelectionList extends _MatSelectionListMixinBase implements Focu
         // Emit a change event because the focused option changed its state through user
         // interaction.
         this._emitChangeEvent(focusedOption);
-
-        // TODO: the `selectionChange` event on the option is deprecated. Remove that in the future.
-        focusedOption._emitDeprecatedChangeEvent();
       }
     }
   }