Make GetRootWindow() return a Window instead of a RootWindow.

chrome/browser/ui/window_sizer/window_sizer_ash_unittest.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/screen_ash.h"
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/test/test_shell_delegate.h"
 #include "ash/wm/window_positioner.h"
 #include "ash/wm/window_resizer.h"
@@ skipping 28 matching lines @@
 
   // TestBrowserWindow overrides:
   virtual void Show() OVERRIDE {
     native_window_->Show();
     Activate();
   }
   virtual void Hide() OVERRIDE {
     native_window_->Hide();
   }
   virtual void Activate() OVERRIDE {
-    GetActivationClient(
+    aura::client::GetActivationClient(
         native_window_->GetRootWindow())->ActivateWindow(native_window_.get());
   }
   virtual gfx::NativeWindow GetNativeWindow() OVERRIDE {
     return native_window_.get();
   }
   virtual gfx::Rect GetBounds() const OVERRIDE {
     return native_window_->bounds();
   }
 
   Browser* browser() { return browser_.get(); }
@@ skipping 774 matching lines @@
                                browser_window->browser(),
                                p1600x1200), ui::SHOW_STATE_MAXIMIZED);
 
   // The popup should favor the initial show state over the command line.
   EXPECT_EQ(GetWindowShowState(ui::SHOW_STATE_NORMAL,
                                ui::SHOW_STATE_NORMAL,
                                BOTH,
                                browser_popup->browser(),
                                p1600x1200), ui::SHOW_STATE_NORMAL);
 }