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

sync/notifier/invalidation_state_tracker.h

Index: sync/notifier/invalidation_state_tracker.h
diff --git a/sync/notifier/invalidation_state_tracker.h b/sync/notifier/invalidation_state_tracker.h
index ba769e99dc713eb8dc5e7eef8dfbfd8e5e04705e..957b9c4d0b5e55bac30255611acb39e1b73d212e 100644
--- a/sync/notifier/invalidation_state_tracker.h
+++ b/sync/notifier/invalidation_state_tracker.h
@@ -40,7 +40,8 @@ struct SYNC_EXPORT InvalidationState {
 };
 
 // TODO(dcheng): Remove this in favor of adding an Equals() method.
-bool operator==(const InvalidationState& lhs, const InvalidationState& rhs);
+SYNC_EXPORT_PRIVATE bool operator==(const InvalidationState& lhs,
+                                    const InvalidationState& rhs);
 
 typedef std::map<invalidation::ObjectId, InvalidationState, ObjectIdLessThan>
     InvalidationStateMap;