sync: move internal_api components used by chrome/browser into internal_api/public

sync/notifier/invalidation_notifier.h

Index: sync/notifier/invalidation_notifier.h
diff --git a/sync/notifier/invalidation_notifier.h b/sync/notifier/invalidation_notifier.h
index 01108f5999d65ce0a0d54ee0f04ed29da3862589..eb099217be05d548efbbd541da847af63abb0664 100644
--- a/sync/notifier/invalidation_notifier.h
+++ b/sync/notifier/invalidation_notifier.h
@@ -21,10 +21,10 @@
 #include "base/observer_list.h"
 #include "base/threading/non_thread_safe.h"
 #include "sync/internal_api/public/syncable/model_type.h"
+#include "sync/internal_api/public/util/weak_handle.h"
 #include "sync/notifier/chrome_invalidation_client.h"
 #include "sync/notifier/invalidation_state_tracker.h"
 #include "sync/notifier/sync_notifier.h"
-#include "sync/util/weak_handle.h"
 
 namespace notifier {
 class PushClient;