Move some sync/notifier to components/invalidation

sync/notifier/invalidation_state_tracker.cc

Index: sync/notifier/invalidation_state_tracker.cc
diff --git a/sync/engine/commit_contribution.cc b/sync/notifier/invalidation_state_tracker.cc
similarity index 55%
copy from sync/engine/commit_contribution.cc
copy to sync/notifier/invalidation_state_tracker.cc
index cef02b57b9021598370cc9e7554ab15042a9489a..ab3ce176649c524f5ebc868f4451832e9b4b6e35 100644
--- a/sync/engine/commit_contribution.cc
+++ b/sync/notifier/invalidation_state_tracker.cc
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "sync/engine/commit_contribution.h"
+#include "sync/notifier/invalidation_state_tracker.h"
 
 namespace syncer {
 
-CommitContribution::CommitContribution() {}
+InvalidationStateTracker::InvalidationStateTracker() {}
 
-CommitContribution::~CommitContribution() {}
+InvalidationStateTracker::~InvalidationStateTracker() {}
 
 }  // namespace syncer