Make nesting/running states a RunLoop rather than a MessageLoop concept.

components/sync/engine_impl/sync_scheduler_impl_unittest.cc

Index: components/sync/engine_impl/sync_scheduler_impl_unittest.cc
diff --git a/components/sync/engine_impl/sync_scheduler_impl_unittest.cc b/components/sync/engine_impl/sync_scheduler_impl_unittest.cc
index da14eed1c1df41de5615098232dcdb7040c0fe02..a62d45cbeae208360ba0bc01948f080236ba7978 100644
--- a/components/sync/engine_impl/sync_scheduler_impl_unittest.cc
+++ b/components/sync/engine_impl/sync_scheduler_impl_unittest.cc
@@ -310,7 +310,7 @@ void RecordSyncShareImpl(SyncShareTimes* times) {
 
 ACTION_P2(RecordSyncShare, times, success) {
   RecordSyncShareImpl(times);
-  if (base::MessageLoop::current()->is_running())
+  if (base::RunLoop::IsRunningOnCurrentThread())
     QuitLoopNow();
   return success;
 }
@@ -319,7 +319,7 @@ ACTION_P3(RecordSyncShareMultiple, times, quit_after, success) {
   RecordSyncShareImpl(times);
   EXPECT_LE(times->size(), quit_after);
   if (times->size() >= quit_after &&
-      base::MessageLoop::current()->is_running()) {
+      base::RunLoop::IsRunningOnCurrentThread()) {
     QuitLoopNow();
   }
   return success;