Support sync mojo IPCs to and from bindings running on a sequence.

mojo/public/cpp/bindings/tests/report_bad_message_unittest.cc

Index: mojo/public/cpp/bindings/tests/report_bad_message_unittest.cc
diff --git a/mojo/public/cpp/bindings/tests/report_bad_message_unittest.cc b/mojo/public/cpp/bindings/tests/report_bad_message_unittest.cc
index 1bf3f7a4b76be5b7f7699286e29864b61ae9f5ed..32357706619f0322e82f823b972ce7354a21c38d 100644
--- a/mojo/public/cpp/bindings/tests/report_bad_message_unittest.cc
+++ b/mojo/public/cpp/bindings/tests/report_bad_message_unittest.cc
@@ -88,10 +88,10 @@ class ReportBadMessageTest : public testing::Test {
       error_handler_.Run();
   }
 
+  base::MessageLoop message_loop;
   TestBadMessagesPtr proxy_;
   TestBadMessagesImpl impl_;
   base::Closure error_handler_;
-  base::MessageLoop message_loop;
 };
 
 TEST_F(ReportBadMessageTest, Request) {