Purge the App Launcher code from Mac

ui/app_list/cocoa/scroll_view_with_no_scrollbars.h

Index: ui/app_list/cocoa/scroll_view_with_no_scrollbars.h
diff --git a/ui/app_list/cocoa/scroll_view_with_no_scrollbars.h b/ui/app_list/cocoa/scroll_view_with_no_scrollbars.h
deleted file mode 100644
index 0697e24046fca53f1343f59517ae79ffb3ec9232..0000000000000000000000000000000000000000
--- a/ui/app_list/cocoa/scroll_view_with_no_scrollbars.h
+++ /dev/null
@@ -1,30 +0,0 @@
-// 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_SCROLL_VIEW_WITH_NO_SCROLLBARS_H_
-#define UI_APP_LIST_COCOA_SCROLL_VIEW_WITH_NO_SCROLLBARS_H_
-
-#include <Cocoa/Cocoa.h>
-
-// Delegate to notify when a user interaction to scroll completes.
-@protocol GestureScrollDelegate
-
-// Called when a scroll gesture is observed, or when it completes.
-- (void)userScrolling:(BOOL)isScrolling;
-
-@end
-
-// NSScrollView has a quirk when created programatically that causes gesture
-// scrolling to fail if it does not have a scroll bar. This provides a scroll
-// view using custom scrollers that are not visible.
-@interface ScrollViewWithNoScrollbars : NSScrollView {
- @private
-  id<GestureScrollDelegate> delegate_;
-}
-
-@property(assign, nonatomic) id<GestureScrollDelegate> delegate;
-
-@end
-
-#endif  // UI_APP_LIST_COCOA_SCROLL_VIEW_WITH_NO_SCROLLBARS_H_