mash: Merge ChromeLauncherController and *Impl subclass.

chrome/browser/ui/ash/launcher/desktop_shell_launcher_context_menu.cc

 // Copyright 2016 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.
 
 #include "chrome/browser/ui/ash/launcher/desktop_shell_launcher_context_menu.h"
 
 DesktopShellLauncherContextMenu::DesktopShellLauncherContextMenu(
-    ChromeLauncherControllerImpl* controller,
+    ChromeLauncherController* controller,
     const ash::ShelfItem* item,
     ash::WmShelf* wm_shelf)
     : LauncherContextMenu(controller, item, wm_shelf) {
   Init();
 }
 
 DesktopShellLauncherContextMenu::~DesktopShellLauncherContextMenu() {}
 
 void DesktopShellLauncherContextMenu::Init() {
   AddShelfOptionsMenu();
 }