Purge the App Launcher code from Mac

ui/app_list/cocoa/item_drag_controller.h

-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef UI_APP_LIST_COCOA_ITEM_DRAG_CONTROLLER_H_
-#define UI_APP_LIST_COCOA_ITEM_DRAG_CONTROLLER_H_
-
-#import <Cocoa/Cocoa.h>
-#import <QuartzCore/QuartzCore.h>
-
-#include "base/mac/scoped_nsobject.h"
-
-@class AppsGridViewItem;
-
-// Controller to manage the animations and transient views that are used when
-// dragging an app list item around the app list grid. When initiated, the item
-// image (only) is grown in an animation, and sticks to the mouse cursor. When
-// released, the label is added to the image and it shrinks and moves to the
-// item location in the grid.
-@interface ItemDragController : NSViewController {
- @private
-  base::scoped_nsobject<CALayer> dragLayer_;
-  base::scoped_nsobject<NSButton> buttonToRestore_;
-  NSPoint mouseOffset_;
-  NSTimeInterval growStart_;
-  BOOL shrinking_;
-}
-
-- (id)initWithGridCellSize:(NSSize)size;
-
-- (void)initiate:(AppsGridViewItem*)item
-    mouseDownLocation:(NSPoint)mouseDownLocation
-      currentLocation:(NSPoint)currentLocation
-            timestamp:(NSTimeInterval)eventTimestamp;
-
-- (void)update:(NSPoint)currentLocation
-     timestamp:(NSTimeInterval)eventTimestamp;
-
-- (void)complete:(AppsGridViewItem*)item
-    targetOrigin:(NSPoint)targetOrigin;
-
-@end
-
-#endif  // UI_APP_LIST_COCOA_ITEM_DRAG_CONTROLLER_H_