Remove calls to deprecated MessageLoop methods on Windows and Linux.

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 f219356606e772fd493c52b1a60e5b9b19f57927..f502f0920ba9edae2857622786f56fab7539bec8 100644
--- a/jingle/notifier/listener/xmpp_push_client_unittest.cc
+++ b/jingle/notifier/listener/xmpp_push_client_unittest.cc
@@ -8,6 +8,7 @@
 
 #include "base/compiler_specific.h"
 #include "base/message_loop/message_loop.h"
+#include "base/run_loop.h"
 #include "jingle/notifier/base/fake_base_task.h"
 #include "jingle/notifier/base/notifier_options.h"
 #include "jingle/notifier/listener/push_client_observer.h"
@@ -48,7 +49,7 @@ class XmppPushClientTest : public testing::Test {
 
   void TearDown() override {
     // Clear out any messages posted by XmppPushClient.
-    message_loop_.RunUntilIdle();
+    base::RunLoop().RunUntilIdle();
     xmpp_push_client_->RemoveObserver(&mock_observer_);
     xmpp_push_client_.reset();
   }