Move UserScript and related into extensions namespace

chrome/browser/extensions/api/tabs/execute_code_in_tab_function.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 CHROME_BROWSER_EXTENSIONS_API_TABS_EXECUTE_CODE_IN_TAB_FUNCTION_H__
 #define CHROME_BROWSER_EXTENSIONS_API_TABS_EXECUTE_CODE_IN_TAB_FUNCTION_H__
 
 #include <string>
 
 #include "chrome/browser/extensions/extension_function.h"
@@ skipping 41 matching lines @@
 
   // Contains extension resource built from path of file which is
   // specified in JSON arguments.
   ExtensionResource resource_;
 
   // If all_frames_ is true, script or CSS text would be injected
   // to all frames; Otherwise only injected to top main frame.
   bool all_frames_;
 
   // The intended time to run the script.
-  UserScript::RunLocation run_at_;
+  extensions::UserScript::RunLocation run_at_;
 };
 
 class TabsExecuteScriptFunction : public ExecuteCodeInTabFunction {
  private:
   virtual ~TabsExecuteScriptFunction() {}
 
   DECLARE_EXTENSION_FUNCTION_NAME("tabs.executeScript")
 };
 
 class TabsInsertCSSFunction : public ExecuteCodeInTabFunction {
  private:
   virtual ~TabsInsertCSSFunction() {}
 
   DECLARE_EXTENSION_FUNCTION_NAME("tabs.insertCSS")
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_TABS_EXECUTE_CODE_IN_TAB_FUNCTION_H__