Migrate callers of message_loop_proxy() to task_runner()

jingle/notifier/listener/xmpp_push_client_unittest.cc

Index: jingle/notifier/listener/xmpp_push_client_unittest.cc
diff --git a/jingle/notifier/listener/xmpp_push_client_unittest.cc b/jingle/notifier/listener/xmpp_push_client_unittest.cc
index abe6775b9a66c564e03c55f11c082f0c53becfb1..f282ca80b01dcf5cb856f7aea88db1f9499170dc 100644
--- a/jingle/notifier/listener/xmpp_push_client_unittest.cc
+++ b/jingle/notifier/listener/xmpp_push_client_unittest.cc
@@ -35,7 +35,7 @@ class XmppPushClientTest : public testing::Test {
   XmppPushClientTest() {
     notifier_options_.request_context_getter =
         new net::TestURLRequestContextGetter(
-            message_loop_.message_loop_proxy());
+            message_loop_.task_runner());
   }
 
   ~XmppPushClientTest() override {}