clean up duplicate @HostBinding and host:{}

Author: annieyw

src/cdk/tree/nested-node.ts

@@ -10,7 +10,6 @@ import {
   ContentChildren,
   Directive,
   ElementRef,
-  HostBinding,
   IterableDiffer,
   IterableDiffers,
   OnDestroy,
@@ -38,11 +37,6 @@ import {getTreeControlFunctionsMissingError} from './tree-errors';
   ]
 })
 export class CdkNestedTreeNode<T> extends CdkTreeNode<T> implements AfterContentInit, OnDestroy {
-  // tslint:disable:no-host-decorator-in-concrete
-  @HostBinding('attr.aria-expanded') _expanded = this.isExpanded;
-  @HostBinding('attr.role') _role = this.role;
-  // tslint:enable:no-host-decorator-in-concrete
-
   /** Differ used to find the changes in the data provided by the data source. */
   private _dataDiffer: IterableDiffer<T>;
 

src/material/tree/node.ts

@@ -42,10 +42,6 @@ const _MatTreeNodeMixinBase: HasTabIndexCtor & CanDisableCtor & typeof CdkTreeNo
   selector: 'mat-tree-node',
   exportAs: 'matTreeNode',
   inputs: ['disabled', 'tabIndex'],
-  host: {
-    '[attr.aria-expanded]': 'isExpanded',
-    '[attr.role]': 'role',
-  },
   providers: [{provide: CdkTreeNode, useExisting: MatTreeNode}]
 })
 export class MatTreeNode<T> extends _MatTreeNodeMixinBase<T>
@@ -88,10 +84,6 @@ export class MatTreeNodeDef<T> extends CdkTreeNodeDef<T> {
 @Directive({
   selector: 'mat-nested-tree-node',
   exportAs: 'matNestedTreeNode',
-  host: {
-    '[attr.aria-expanded]': 'isExpanded',
-    '[attr.role]': 'role',
-  },
   providers: [
     {provide: CdkNestedTreeNode, useExisting: MatNestedTreeNode},
     {provide: CdkTreeNode, useExisting: MatNestedTreeNode},