Convert chrome_url_data_manager (previously a global) into a

chrome/browser/dom_ui/chrome_url_data_manager.h

 // Copyright (c) 2006-2008 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_DOM_UI_CHROME_URL_DATA_MANAGER_H_
 #define CHROME_BROWSER_DOM_UI_CHROME_URL_DATA_MANAGER_H_
 
 #include <map>
 #include <string>
 
@@ skipping 140 matching lines @@
   RequestID next_request_id_;
 };
 
 // Since we have a single global ChromeURLDataManager, we don't need to
 // grab a reference to it when creating Tasks involving it.
 template <> struct RunnableMethodTraits<ChromeURLDataManager> {
   void RetainCallee(ChromeURLDataManager* manager) {}
   void ReleaseCallee(ChromeURLDataManager* manager) {}
 };
 
-// The single global instance of ChromeURLDataManager.
-extern ChromeURLDataManager chrome_url_data_manager;
-
 // Register our special URL handler under our special URL scheme.
 // Must be done once at startup.
 void RegisterURLRequestChromeJob();
 
 // Undoes the registration done by RegisterURLRequestChromeJob.
 void UnregisterURLRequestChromeJob();
 
 #endif  // CHROME_BROWSER_DOM_UI_CHROME_URL_DATA_MANAGER_H_