Get rid of MessageLoop* caching in extensions code.

chrome/browser/extensions/extension_updater.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_EXTENSIONS_EXTENSION_UPDATER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_UPDATER_H_
 
 #include <deque>
 #include <string>
 #include <vector>
 
 #include "base/ref_counted.h"
 #include "base/scoped_ptr.h"
 #include "base/scoped_temp_dir.h"
 #include "base/task.h"
 #include "base/time.h"
 #include "base/timer.h"
 #include "chrome/browser/extensions/extensions_service.h"
 #include "chrome/browser/net/url_fetcher.h"
 #include "chrome/common/extensions/update_manifest.h"
 #include "googleurl/src/gurl.h"
 
 class Extension;
 class ExtensionUpdaterTest;
-class MessageLoop;
 class ExtensionUpdaterFileHandler;
 class PrefService;
 
 // A class for doing auto-updates of installed Extensions. Used like this:
 //
 // ExtensionUpdater* updater = new ExtensionUpdater(my_extensions_service,
 //                                                  pref_service,
-//                                                  update_frequency_secs,
-//                                                  file_io_loop,
-//                                                  io_loop);
+//                                                  update_frequency_secs);
 // updater.Start();
 // ....
 // updater.Stop();
 class ExtensionUpdater
     : public URLFetcher::Delegate,
       public base::RefCountedThreadSafe<ExtensionUpdater> {
  public:
   // Holds a pointer to the passed |service|, using it for querying installed
   // extensions and installing updated ones. The |frequency_seconds| parameter
   // controls how often update checks are scheduled.
   ExtensionUpdater(ExtensionUpdateService* service,
                    PrefService* prefs,
-                   int frequency_seconds,
-                   MessageLoop* file_io_loop,
-                   MessageLoop* io_loop);
+                   int frequency_seconds);
 
   virtual ~ExtensionUpdater();
 
   // Starts the updater running.
   void Start();
 
   // Stops the updater running, cancelling any outstanding update manifest and
   // crx downloads. Does not cancel any in-progress installs.
   void Stop();
 
@@ skipping 110 matching lines @@
 
   // The extension currently being fetched (if any).
   ExtensionFetch current_extension_fetch_;
 
   // Pointer back to the service that owns this ExtensionUpdater.
   ExtensionUpdateService* service_;
 
   base::OneShotTimer<ExtensionUpdater> timer_;
   int frequency_seconds_;
 
-  // The MessageLoop where we should do file I/O.
-  MessageLoop* file_io_loop_;
-
-  // The IO loop for IPC.
-  MessageLoop* io_loop_;
-
   PrefService* prefs_;
 
   scoped_refptr<ExtensionUpdaterFileHandler> file_handler_;
   bool blacklist_checks_enabled_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionUpdater);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_UPDATER_H_