Move MessageLoop to base namespace.

sync/internal_api/public/http_bridge.h

Index: sync/internal_api/public/http_bridge.h
diff --git a/sync/internal_api/public/http_bridge.h b/sync/internal_api/public/http_bridge.h
index 31863fdcd24cff9956395d8a52d100ce9e1d1096..6619adf3f5553f1f38258bb6404e89882077e253 100644
--- a/sync/internal_api/public/http_bridge.h
+++ b/sync/internal_api/public/http_bridge.h
@@ -21,9 +21,12 @@
 #include "sync/internal_api/public/http_post_provider_factory.h"
 #include "sync/internal_api/public/http_post_provider_interface.h"
 
-class MessageLoop;
 class HttpBridgeTest;
 
+namespace base {
+class MessageLoop;
+}
+
 namespace net {
 class HttpResponseHeaders;
 class HttpUserAgentSettings;
@@ -157,7 +160,7 @@ class SYNC_EXPORT_PRIVATE HttpBridge
   // the network.
   // This should be the main syncer thread (SyncerThread) which is what blocks
   // on network IO through curl_easy_perform.
-  MessageLoop* const created_on_loop_;
+  base::MessageLoop* const created_on_loop_;
 
   // The URL to POST to.
   GURL url_for_request_;