Move MessageLoop to base namespace.

chrome/browser/sync/glue/typed_url_model_associator.h

Index: chrome/browser/sync/glue/typed_url_model_associator.h
diff --git a/chrome/browser/sync/glue/typed_url_model_associator.h b/chrome/browser/sync/glue/typed_url_model_associator.h
index 3a499939492bd096f90c27c48405a0f454bbc79d..66c3841ae0509984778f46c1af5358d9fa70f406 100644
--- a/chrome/browser/sync/glue/typed_url_model_associator.h
+++ b/chrome/browser/sync/glue/typed_url_model_associator.h
@@ -19,9 +19,12 @@
 #include "sync/protocol/typed_url_specifics.pb.h"
 
 class GURL;
-class MessageLoop;
 class ProfileSyncService;
 
+namespace base {
+class MessageLoop;
+}
+
 namespace history {
 class HistoryBackend;
 class URLRow;
@@ -187,7 +190,7 @@ class TypedUrlModelAssociator : public AssociatorInterface {
   ProfileSyncService* sync_service_;
   history::HistoryBackend* history_backend_;
 
-  MessageLoop* expected_loop_;
+  base::MessageLoop* expected_loop_;
 
   // Lock to ensure exclusive access to the pending_abort_ flag.
   base::Lock pending_abort_lock_;