Removes WmRootWindowController::GetShell()

ash/mus/bridge/wm_root_window_controller_mus.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 "ash/mus/bridge/wm_root_window_controller_mus.h"
 
 #include "ash/common/shelf/wm_shelf.h"
 #include "ash/mus/bridge/wm_shell_mus.h"
 #include "ash/mus/bridge/wm_window_mus.h"
 #include "ash/mus/root_window_controller.h"
@@ skipping 55 matching lines @@
 }
 
 void WmRootWindowControllerMus::MoveWindowsTo(WmWindow* dest) {
   WmRootWindowController::MoveWindowsTo(dest);
 }
 
 bool WmRootWindowControllerMus::HasShelf() {
   return GetShelf() != nullptr;
 }
 
-WmShell* WmRootWindowControllerMus::GetShell() {
-  return shell_;
-}
-
 WmShelf* WmRootWindowControllerMus::GetShelf() {
   return root_window_controller_->wm_shelf();
 }
 
 WmWindow* WmRootWindowControllerMus::GetWindow() {
   return WmWindowMus::Get(root_window_controller_->root());
 }
 
 bool WmRootWindowControllerMus::ShouldDestroyWindowInCloseChildWindows(
     WmWindow* window) {
   aura::WindowTreeClient* window_tree_client =
       root_window_controller_->window_manager()->window_tree_client();
   aura::Window* aura_window = WmWindowMus::GetAuraWindow(window);
   aura::WindowMus* window_mus = aura::WindowMus::Get(aura_window);
   return window_tree_client->WasCreatedByThisClient(window_mus) ||
          window_tree_client->IsRoot(window_mus);
 }
 
 }  // namespace mus
 }  // namespace ash