Purge the App Launcher code from Mac

ui/app_list/cocoa/apps_pagination_model_observer.h

Index: ui/app_list/cocoa/apps_pagination_model_observer.h
diff --git a/ui/app_list/cocoa/apps_pagination_model_observer.h b/ui/app_list/cocoa/apps_pagination_model_observer.h
deleted file mode 100644
index a2f463f9dabde6cc9f4a330d8831a8b43f380247..0000000000000000000000000000000000000000
--- a/ui/app_list/cocoa/apps_pagination_model_observer.h
+++ /dev/null
@@ -1,26 +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_APPS_PAGINATION_MODEL_OBSERVER_H_
-#define UI_APP_LIST_COCOA_APPS_PAGINATION_MODEL_OBSERVER_H_
-
-// Observer protocol for page changes. Compare with
-// app_list::PaginationModelObserver.
-@protocol AppsPaginationModelObserver
-
-// Invoked when the total number of pages has changed.
-- (void)totalPagesChanged;
-
-// Invoked when the selected page index is changed.
-- (void)selectedPageChanged:(int)newSelected;
-
-// Invoked when the portion of pages that are visible have changed.
-- (void)pageVisibilityChanged;
-
-// Return a pager segment at |locationInWindow| or -1 if there is none.
-- (NSInteger)pagerSegmentAtLocation:(NSPoint)locationInWindow;
-
-@end
-
-#endif  // UI_APP_LIST_COCOA_APPS_PAGINATION_MODEL_OBSERVER_H_