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

content/browser/webui/url_data_manager_backend.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 "content/browser/webui/url_data_manager_backend.h"
 
 #include <set>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 693 matching lines @@
   // Look up additional request info to pass down.
   int child_id = -1;
   ResourceRequestInfo::WebContentsGetter wc_getter;
   const ResourceRequestInfo* info = ResourceRequestInfo::ForRequest(request);
   if (info) {
     child_id = info->GetChildID();
     wc_getter = info->GetWebContentsGetterForRequest();
   }
 
   // Forward along the request to the data source.
-  base::MessageLoop* target_message_loop =
-      source->source()->MessageLoopForRequestPath(path);
-  if (!target_message_loop) {
+  scoped_refptr<base::SingleThreadTaskRunner> target_runner =
+      source->source()->TaskRunnerForRequestPath(path);
+  if (!target_runner) {
     job->MimeTypeAvailable(source->source()->GetMimeType(path));
     // Eliminate potentially dangling pointer to avoid future use.
     job = nullptr;
 
     // The DataSource is agnostic to which thread StartDataRequest is called
     // on for this path.  Call directly into it from this thread, the IO
     // thread.
     source->source()->StartDataRequest(
         path, wc_getter,
         base::Bind(&URLDataSourceImpl::SendResponse, source, request_id));
   } else {
     // URLRequestChromeJob should receive mime type before data. This
     // is guaranteed because request for mime type is placed in the
     // message loop before request for data. And correspondingly their
     // replies are put on the IO thread in the same order.
-    target_message_loop->task_runner()->PostTask(
+    target_runner->PostTask(
         FROM_HERE, base::Bind(&GetMimeTypeOnUI, base::RetainedRef(source), path,
                               job->AsWeakPtr()));
 
     // The DataSource wants StartDataRequest to be called on a specific thread,
     // usually the UI thread, for this path.
-    target_message_loop->task_runner()->PostTask(
+    target_runner->PostTask(
         FROM_HERE, base::Bind(&URLDataManagerBackend::CallStartRequest,
                               base::RetainedRef(source), path, child_id,
                               wc_getter, request_id));
   }
   return true;
 }
 
 URLDataSourceImpl* URLDataManagerBackend::GetDataSourceFromURL(
     const GURL& url) {
   // The input usually looks like: chrome://source_name/extra_bits?foo
@@ skipping 100 matching lines @@
 
 }  // namespace
 
 net::URLRequestJobFactory::ProtocolHandler* CreateDevToolsProtocolHandler(
     ResourceContext* resource_context,
     bool is_incognito) {
   return new DevToolsJobFactory(resource_context, is_incognito);
 }
 
 }  // namespace content