Fix possible overlapping icons in shelf on sync.

chrome/browser/ui/ash/launcher/chrome_launcher_controller_impl.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 CHROME_BROWSER_UI_ASH_LAUNCHER_CHROME_LAUNCHER_CONTROLLER_IMPL_H_
 #define CHROME_BROWSER_UI_ASH_LAUNCHER_CHROME_LAUNCHER_CONTROLLER_IMPL_H_
 
 #include <list>
 #include <memory>
 
@@ skipping 201 matching lines @@
       ash::ShelfItemType shelf_item_type);
 
   // Invoked when the associated browser or app is closed.
   void LauncherItemClosed(ash::ShelfID id);
 
   // Internal helpers for pinning and unpinning that handle both
   // client-triggered and internal pinning operations.
   void DoPinAppWithID(const std::string& app_id);
   void DoUnpinAppWithID(const std::string& app_id, bool update_prefs);
 
-  // Pin a running app with |shelf_id| internally to |index|. It returns
-  // the index where the item was pinned.
-  int PinRunningAppInternal(int index, ash::ShelfID shelf_id);
+  // Pin a running app with |shelf_id| internally to |index|.
+  void PinRunningAppInternal(int index, ash::ShelfID shelf_id);
 
   // Unpin a locked application. This is an internal call which converts the
   // model type of the given app index from a shortcut into an unpinned running
   // app.
   void UnpinRunningAppInternal(int index);
 
   // Updates pin position for the item specified by |id| in sync model.
   void SyncPinPosition(ash::ShelfID id);
 
   // Re-syncs shelf model.
@@ skipping 132 matching lines @@
   typedef std::vector<std::string> RunningAppListIds;
   typedef std::map<std::string, RunningAppListIds> RunningAppListIdMap;
   RunningAppListIdMap last_used_running_application_order_;
 
   base::WeakPtrFactory<ChromeLauncherControllerImpl> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeLauncherControllerImpl);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_LAUNCHER_CHROME_LAUNCHER_CONTROLLER_IMPL_H_