Use base::MessageLoop in more files.

chrome/browser/ui/webui/theme_source.cc

 // 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.
 
 #include "chrome/browser/ui/webui/theme_source.h"
 
 #include "base/memory/ref_counted_memory.h"
 #include "base/message_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 79 matching lines @@
   webui::ParsePathAndScale(GURL(GetThemePath() + path), &uncached_path, NULL);
 
   if (uncached_path == kNewTabCSSPath ||
       uncached_path == kNewIncognitoTabCSSPath) {
     return "text/css";
   }
 
   return "image/png";
 }
 
-MessageLoop* ThemeSource::MessageLoopForRequestPath(
+base::MessageLoop* ThemeSource::MessageLoopForRequestPath(
     const std::string& path) const {
   std::string uncached_path;
   webui::ParsePathAndScale(GURL(GetThemePath() + path), &uncached_path, NULL);
 
   if (uncached_path == kNewTabCSSPath ||
       uncached_path == kNewIncognitoTabCSSPath) {
     // We generated and cached this when we initialized the object.  We don't
     // have to go back to the UI thread to send the data.
     return NULL;
   }
@@ skipping 32 matching lines @@
 
     scoped_refptr<base::RefCountedMemory> image_data(tp->GetRawData(
         resource_id, scale_factor));
     callback.Run(image_data);
   } else {
     DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
     const ResourceBundle& rb = ResourceBundle::GetSharedInstance();
     callback.Run(rb.LoadDataResourceBytesForScale(resource_id, scale_factor));
   }
 }