URLFetcher uses a TaskRunner instead of a message loop.

net/url_request/test_url_fetcher_factory.cc

Index: net/url_request/test_url_fetcher_factory.cc
diff --git a/net/url_request/test_url_fetcher_factory.cc b/net/url_request/test_url_fetcher_factory.cc
index b191e122975d51880a46c46a880b41a859abef35..ace90f9d10f7c353ccd49f3216befbc9eed83f6b 100644
--- a/net/url_request/test_url_fetcher_factory.cc
+++ b/net/url_request/test_url_fetcher_factory.cc
@@ -125,11 +125,11 @@ base::TimeDelta TestURLFetcher::GetBackoffDelay() const {
 
 void TestURLFetcher::SaveResponseToFileAtPath(
     const FilePath& file_path,
-    scoped_refptr<base::MessageLoopProxy> file_message_loop_proxy) {
+    scoped_refptr<base::TaskRunner> file_task_runner) {
 }
 
 void TestURLFetcher::SaveResponseToTemporaryFile(
-    scoped_refptr<base::MessageLoopProxy> file_message_loop_proxy) {
+    scoped_refptr<base::TaskRunner> file_task_runner) {
 }
 
 HttpResponseHeaders* TestURLFetcher::GetResponseHeaders() const {