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

content/public/browser/url_data_source.cc

Index: content/public/browser/url_data_source.cc
diff --git a/content/public/browser/url_data_source.cc b/content/public/browser/url_data_source.cc
index 7933952f34432ea36e5e2940fcbd6e49e211dd80..7bcbe1d2eb04d80273f628664c7c380d10afab7f 100644
--- a/content/public/browser/url_data_source.cc
+++ b/content/public/browser/url_data_source.cc
@@ -16,9 +16,9 @@ void URLDataSource::Add(BrowserContext* browser_context,
   URLDataManager::AddDataSource(browser_context, source);
 }
 
-base::MessageLoop* URLDataSource::MessageLoopForRequestPath(
-    const std::string& path) const {
-  return BrowserThread::UnsafeGetMessageLoopForThread(BrowserThread::UI);
+scoped_refptr<base::SingleThreadTaskRunner>
+URLDataSource::TaskRunnerForRequestPath(const std::string& path) const {
+  return BrowserThread::GetTaskRunnerForThread(BrowserThread::UI);
 }
 
 bool URLDataSource::ShouldReplaceExistingSource() const {