Move chromeos code to namespace chromeos.

chrome/browser/chromeos/settings_page_view.h

 // Copyright (c) 2009 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 CHROME_BROWSER_CHROMEOS_SETTINGS_PAGE_VIEW_H_
 #define CHROME_BROWSER_CHROMEOS_SETTINGS_PAGE_VIEW_H_
 
 #include <gtk/gtk.h>
 
 #include "chrome/browser/views/options/options_page_view.h"
 
+namespace chromeos {
+
 class SettingsContentsView;
 
 // Settings page for Chrome OS.
 class SettingsPageView : public OptionsPageView {
  public:
   explicit SettingsPageView(Profile* profile);
 
   // Wraps the SettingsPageView in a GtkWidget and returns it. It's up to the
   // caller to delete (unref) the returned widget, which in turn deletes this
   // SettingsPageView.
   GtkWidget* WrapInGtkWidget();
 
  protected:
   virtual void InitControlLayout();
 
  private:
   // Controls for the Settings page
   SettingsContentsView* settings_contents_view_;
 
   DISALLOW_COPY_AND_ASSIGN(SettingsPageView);
 };
 
+}  // namespace chromeos
+
 #endif  // CHROME_BROWSER_CHROMEOS_SETTINGS_PAGE_VIEW_H_