Consolidate javascript_dialog_manager.h and javascript_dialog_manager_impl.h

components/app_modal/app_modal_dialog_queue.h

 // 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.
 
 #ifndef COMPONENTS_APP_MODAL_APP_MODAL_DIALOG_QUEUE_H_
 #define COMPONENTS_APP_MODAL_APP_MODAL_DIALOG_QUEUE_H_
 
 #include <deque>
 
 #include "base/basictypes.h"
 
+template <typename T> struct DefaultSingletonTraits;
+
+namespace app_modal {
+
 class AppModalDialog;
 
-template <typename T> struct DefaultSingletonTraits;
-
 // Keeps a queue of AppModalDialogs, making sure only one app modal
 // dialog is shown at a time.
 // This class is a singleton.
 class AppModalDialogQueue {
  public:
   typedef std::deque<AppModalDialog*>::iterator iterator;
 
   // Returns the singleton instance.
   static AppModalDialogQueue* GetInstance();
 
@@ skipping 53 matching lines @@
   // active app-modal dialog box.
   AppModalDialog* active_dialog_;
 
   // Stores if |ShowModalDialog()| is currently being called on an app-modal
   // dialog.
   bool showing_modal_dialog_;
 
   DISALLOW_COPY_AND_ASSIGN(AppModalDialogQueue);
 };
 
+}  // namespace app_modal
+
 #endif  // COMPONENTS_APP_MODAL_APP_MODAL_DIALOG_QUEUE_H_