sync: Use base::MessageLoop.

sync/internal_api/public/engine/passive_model_worker.cc

Index: sync/internal_api/public/engine/passive_model_worker.cc
diff --git a/sync/internal_api/public/engine/passive_model_worker.cc b/sync/internal_api/public/engine/passive_model_worker.cc
index 10d20ee4f87be8773483ca2d8074283b0e76395f..50d00cf08176b5b65ce1d9d446bbf66e40784747 100644
--- a/sync/internal_api/public/engine/passive_model_worker.cc
+++ b/sync/internal_api/public/engine/passive_model_worker.cc
@@ -8,7 +8,7 @@
 
 namespace syncer {
 
-PassiveModelWorker::PassiveModelWorker(const MessageLoop* sync_loop)
+PassiveModelWorker::PassiveModelWorker(const base::MessageLoop* sync_loop)
     : sync_loop_(sync_loop) {}
 
 PassiveModelWorker::~PassiveModelWorker() {
@@ -16,7 +16,7 @@ PassiveModelWorker::~PassiveModelWorker() {
 
 SyncerError PassiveModelWorker::DoWorkAndWaitUntilDone(
     const WorkCallback& work) {
-  DCHECK_EQ(MessageLoop::current(), sync_loop_);
+  DCHECK_EQ(base::MessageLoop::current(), sync_loop_);
   // Simply do the work on the current thread.
   return work.Run();
 }