chore: remove duplicated FocusKeyManager

Removes the FocusKeyManager class that was duplicated from the CDK.

Author: crisbeto

src/lib/chips/chip-list.spec.ts

@@ -3,7 +3,7 @@ import {Component, DebugElement, QueryList} from '@angular/core';
 import {By} from '@angular/platform-browser';
 import {NoopAnimationsModule} from '@angular/platform-browser/animations';
 import {MdChipList, MdChipsModule} from './index';
-import {FocusKeyManager} from '../core/a11y/focus-key-manager';
+import {FocusKeyManager} from '@angular/cdk/a11y';
 import {createKeyboardEvent} from '@angular/cdk/testing';
 
 import {MdInputModule} from '../input/index';

src/lib/chips/chip-list.ts

@@ -21,7 +21,7 @@ import {
 } from '@angular/core';
 
 import {MdChip} from './chip';
-import {FocusKeyManager} from '../core/a11y/focus-key-manager';
+import {FocusKeyManager} from '@angular/cdk/a11y';
 import {BACKSPACE, DELETE, LEFT_ARROW, RIGHT_ARROW, UP_ARROW} from '../core/keyboard/keycodes';
 import {Directionality} from '@angular/cdk/bidi';
 import {Subscription} from 'rxjs/Subscription';

src/lib/core/a11y/focus-key-manager.ts

@@ -6,34 +6,4 @@
  * found in the LICENSE file at https://angular.io/license
  */
 
-import {QueryList} from '@angular/core';
-import {ListKeyManager, CanDisable} from './list-key-manager';
-
-/**
- * This is the interface for focusable items (used by the FocusKeyManager).
- * Each item must know how to focus itself and whether or not it is currently disabled.
- */
-export interface Focusable extends CanDisable {
-  focus(): void;
-}
-
-
-export class FocusKeyManager extends ListKeyManager<Focusable> {
-
-  constructor(items: QueryList<Focusable>) {
-    super(items);
-  }
-
-  /**
-   * This method sets the active item to the item at the specified index.
-   * It also adds focuses the newly active item.
-   */
-  setActiveItem(index: number): void {
-    super.setActiveItem(index);
-
-    if (this.activeItem) {
-      this.activeItem.focus();
-    }
-  }
-
-}
+export {FocusKeyManager, Focusable} from '@angular/cdk/a11y';

src/lib/menu/menu-directive.ts

@@ -27,7 +27,7 @@ import {AnimationEvent} from '@angular/animations';
 import {MenuPositionX, MenuPositionY} from './menu-positions';
 import {throwMdMenuInvalidPositionX, throwMdMenuInvalidPositionY} from './menu-errors';
 import {MdMenuItem} from './menu-item';
-import {FocusKeyManager} from '../core/a11y/focus-key-manager';
+import {FocusKeyManager} from '@angular/cdk/a11y';
 import {MdMenuPanel} from './menu-panel';
 import {Subscription} from 'rxjs/Subscription';
 import {transformMenu, fadeInItems} from './menu-animations';

src/lib/select/select.ts

@@ -31,7 +31,7 @@ import {
 import {NgForm, FormGroupDirective} from '@angular/forms';
 import {MdOption, MdOptionSelectionChange, MdOptgroup} from '../core/option/index';
 import {ENTER, SPACE, UP_ARROW, DOWN_ARROW, HOME, END} from '../core/keyboard/keycodes';
-import {FocusKeyManager} from '../core/a11y/focus-key-manager';
+import {FocusKeyManager} from '@angular/cdk/a11y';
 import {Directionality} from '../core/bidi/index';
 import {Observable} from 'rxjs/Observable';
 import {Subscription} from 'rxjs/Subscription';