Move AppWindow to extensions

extensions/browser/app_window/app_window_interactive_uitest.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 "chrome/browser/apps/app_browsertest_util.h"
 #include "extensions/browser/app_window/native_app_window.h"
 
-using extensions::PlatformAppBrowserTest;
-using extensions::Extension;
-
-namespace apps {
+namespace extensions {
 
 namespace {
 
 class AppWindowTest : public PlatformAppBrowserTest {
  protected:
   void CheckAlwaysOnTopToFullscreen(AppWindow* window) {
     ASSERT_TRUE(window->GetBaseWindow()->IsAlwaysOnTop());
 
     // The always-on-top property should be temporarily disabled when the window
     // enters fullscreen.
@@ skipping 158 matching lines @@
   window->SetAlwaysOnTop(false);
   EXPECT_FALSE(window->GetBaseWindow()->IsAlwaysOnTop());
 
   // Ensure that always-on-top remains disabled.
   window->Restore();
   EXPECT_FALSE(window->GetBaseWindow()->IsAlwaysOnTop());
 
   CloseAppWindow(window);
 }
 
-}  // namespace apps
+}  // namespace extensions