Move MessageLoop to base namespace.

chrome/browser/sync/glue/password_model_associator.h

Index: chrome/browser/sync/glue/password_model_associator.h
diff --git a/chrome/browser/sync/glue/password_model_associator.h b/chrome/browser/sync/glue/password_model_associator.h
index 303df9f552b6d357be1af5f3b0dafe1b2c4c49d9..c1e2cf31d19da2492d750fcee272b529c25caad0 100644
--- a/chrome/browser/sync/glue/password_model_associator.h
+++ b/chrome/browser/sync/glue/password_model_associator.h
@@ -17,10 +17,13 @@
 #include "chrome/browser/sync/glue/model_associator.h"
 #include "sync/protocol/password_specifics.pb.h"
 
-class MessageLoop;
 class PasswordStore;
 class ProfileSyncService;
 
+namespace base {
+class MessageLoop;
+}
+
 namespace content {
 struct PasswordForm;
 }
@@ -133,7 +136,7 @@ class PasswordModelAssociator
   base::Lock abort_association_pending_lock_;
   bool abort_association_pending_;
 
-  MessageLoop* expected_loop_;
+  base::MessageLoop* expected_loop_;
 
   PasswordToSyncIdMap id_map_;
   SyncIdToPasswordMap id_map_inverse_;