Replace URLDataSource::MessageLoopForRequestPath() with TaskRunnerForRequestPath().

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/message_loop.h"
 #include "base/strings/string_number_conversions.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 143 matching lines @@
     SendThemeBitmap(callback, resource_id, scale);
   }
 }
 
 std::string ThemeSource::GetMimeType(const std::string& path) const {
   std::string parsed_path;
   webui::ParsePathAndScale(GetThemeUrl(path), &parsed_path, nullptr);
   return IsNewTabCssPath(parsed_path) ? "text/css" : "image/png";
 }
 
-base::MessageLoop* ThemeSource::MessageLoopForRequestPath(
-    const std::string& path) const {
+scoped_refptr<base::SingleThreadTaskRunner>
+ThemeSource::TaskRunnerForRequestPath(const std::string& path) const {
   std::string parsed_path;
   webui::ParsePathAndScale(GetThemeUrl(path), &parsed_path, nullptr);
 
   if (IsNewTabCssPath(parsed_path)) {
     // 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 nullptr;
   }
 
   // If it's not a themeable image, we don't need to go to the UI thread.
   int resource_id = ResourcesUtil::GetThemeResourceId(parsed_path);
-  return BrowserThemePack::IsPersistentImageID(resource_id) ?
-      content::URLDataSource::MessageLoopForRequestPath(path) : nullptr;
+  return BrowserThemePack::IsPersistentImageID(resource_id)
+             ? content::URLDataSource::TaskRunnerForRequestPath(path)
+             : nullptr;
 }
 
 bool ThemeSource::ShouldServiceRequest(const net::URLRequest* request) const {
   return request->url().SchemeIs(chrome::kChromeSearchScheme) ?
       InstantIOContext::ShouldServiceRequest(request) :
       URLDataSource::ShouldServiceRequest(request);
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // ThemeSource, private:
@@ skipping 30 matching lines @@
   } else {
     DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
     // Fetching image data in ResourceBundle should happen on the UI thread. See
     // crbug.com/449277
     content::BrowserThread::PostTaskAndReply(
         content::BrowserThread::UI, FROM_HERE,
         base::Bind(&ProcessResourceOnUiThread, resource_id, scale, data),
         base::Bind(callback, data));
   }
 }