Convert chrome_url_data_manager (previously a global) into a Singleton. This

chrome/browser/browser_about_handler.cc

 // 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.
 
 #include "chrome/browser/browser_about_handler.h"
 
 #include <string>
 #include <vector>
 
 #include "app/l10n_util.h"
@@ skipping 550 matching lines @@
 // AboutSource -----------------------------------------------------------------
 
 AboutSource::AboutSource()
     : DataSource(chrome::kAboutScheme, MessageLoop::current()) {
   // This should be a singleton.
   DCHECK(!about_source);
   about_source = this;
 
   // Add us to the global URL handler on the IO thread.
   g_browser_process->io_thread()->message_loop()->PostTask(FROM_HERE,
-      NewRunnableMethod(&chrome_url_data_manager,
+      NewRunnableMethod(Singleton<ChromeURLDataManager>().get(),
           &ChromeURLDataManager::AddDataSource, this));
 }
 
 AboutSource::~AboutSource() {
   about_source = NULL;
 }
 
 void AboutSource::StartDataRequest(const std::string& path_raw,
                                    int request_id) {
   std::string path = path_raw;
@@ skipping 312 matching lines @@
     // Run the dialog. This will re-use the existing one if it's already up.
     AboutIPCDialog::RunDialog();
     return true;
   }
 #endif
 
 #endif  // OFFICIAL_BUILD
 
   return false;
 }