Rename GetRootWindow() -> GetPrimaryRootWindow()

ash/wm/shadow_controller.cc

 // Copyright (c) 2012 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/wm/shadow_controller.h"
 
 #include <utility>
 
 #include "ash/shell.h"
 #include "ash/wm/shadow.h"
@@ skipping 54 matching lines @@
   }
   return Shadow::STYLE_INACTIVE;
 }
 
 }  // namespace
 
 ShadowController::ShadowController()
     : ALLOW_THIS_IN_INITIALIZER_LIST(observer_manager_(this)) {
   aura::Env::GetInstance()->AddObserver(this);
   // Watch for window activation changes.
-  Shell::GetRootWindow()->AddObserver(this);
+  Shell::GetPrimaryRootWindow()->AddObserver(this);
 }
 
 ShadowController::~ShadowController() {
-  Shell::GetRootWindow()->RemoveObserver(this);
+  Shell::GetPrimaryRootWindow()->RemoveObserver(this);
   aura::Env::GetInstance()->RemoveObserver(this);
 }
 
 void ShadowController::OnWindowInitialized(aura::Window* window) {
   observer_manager_.Add(window);
   SetShadowType(window, GetShadowTypeFromWindow(window));
   HandlePossibleShadowVisibilityChange(window);
 }
 
 void ShadowController::OnWindowPropertyChanged(aura::Window* window,
@@ skipping 75 matching lines @@
 
   shadow->Init(ShouldUseSmallShadowForWindow(window) ?
                Shadow::STYLE_SMALL : Shadow::STYLE_ACTIVE);
   shadow->SetContentBounds(gfx::Rect(window->bounds().size()));
   shadow->layer()->SetVisible(ShouldShowShadowForWindow(window));
   window->layer()->Add(shadow->layer());
 }
 
 }  // namespace internal
 }  // namespace ash