Promotes more accessors from WmShell to Shell

ash/common/wm/maximize_mode/maximize_mode_window_manager.cc

 // Copyright 2014 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/common/wm/maximize_mode/maximize_mode_window_manager.h"
 
 #include "ash/common/ash_switches.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/wm/maximize_mode/maximize_mode_event_handler.h"
 #include "ash/common/wm/maximize_mode/maximize_mode_window_state.h"
@@ skipping 15 matching lines @@
 #include "ui/aura/client/aura_constants.h"
 #include "ui/display/screen.h"
 
 namespace ash {
 
 namespace {
 
 // Exits overview mode if it is currently active.
 void CancelOverview() {
   WindowSelectorController* controller =
-      WmShell::Get()->window_selector_controller();
+      Shell::Get()->window_selector_controller();
   if (controller->IsSelecting())
     controller->OnSelectionEnded();
 }
 
 }  // namespace
 
 MaximizeModeWindowManager::~MaximizeModeWindowManager() {
   // Overview mode needs to be ended before exiting maximize mode to prevent
   // transforming windows which are currently in
   // overview: http://crbug.com/366605
@@ skipping 272 matching lines @@
     RootWindowController* controller = root->GetRootWindowController();
     WmWindow* default_container =
         root->GetChildByShellWindowId(kShellWindowId_DefaultContainer);
     controller->workspace_controller()->SetMaximizeBackdropDelegate(
         enable ? base::MakeUnique<WorkspaceBackdropDelegate>(default_container)
                : nullptr);
   }
 }
 
 }  // namespace ash