[sync] Componentize sync: Part 6: Add more SYNC_EXPORTs to files in src/sync/

sync/notifier/invalidation_handler.h

Index: sync/notifier/invalidation_handler.h
diff --git a/sync/notifier/invalidation_handler.h b/sync/notifier/invalidation_handler.h
index 0dd472115122510c44c005f6b66a597f9740c21c..057c37b20485328b6a5e1cb0397acf36f39a05f9 100644
--- a/sync/notifier/invalidation_handler.h
+++ b/sync/notifier/invalidation_handler.h
@@ -1,10 +1,11 @@
-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
+// Copyright 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef SYNC_NOTIFIER_INVALIDATION_HANDLER_H_
 #define SYNC_NOTIFIER_INVALIDATION_HANDLER_H_
 
+#include "sync/base/sync_export.h"
 #include "sync/notifier/invalidator_state.h"
 #include "sync/notifier/object_id_invalidation_map.h"
 
@@ -17,7 +18,7 @@ enum IncomingInvalidationSource {
   LOCAL_INVALIDATION,
 };
 
-class InvalidationHandler {
+class SYNC_EXPORT InvalidationHandler {
  public:
   // Called when the invalidator state changes.
   virtual void OnInvalidatorStateChange(InvalidatorState state) = 0;