Finish decoupling sync and invalidations

components/invalidation/ack_handler.cc

Index: components/invalidation/ack_handler.cc
diff --git a/components/invalidation/invalidation_handler.cc b/components/invalidation/ack_handler.cc
similarity index 58%
copy from components/invalidation/invalidation_handler.cc
copy to components/invalidation/ack_handler.cc
index bdc4b8f86f602bf30f562bcc0a718041bca513f8..68dc028092a0bd3c8853ee620bd8beaccbdeae98 100644
--- a/components/invalidation/invalidation_handler.cc
+++ b/components/invalidation/ack_handler.cc
@@ -2,14 +2,16 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "components/invalidation/invalidation_handler.h"
+#include "components/invalidation/ack_handler.h"
+
+#include "components/invalidation/invalidation.h"
 
 namespace syncer {
 
-InvalidationHandler::InvalidationHandler() {
+AckHandler::AckHandler() {
 }
 
-InvalidationHandler::~InvalidationHandler() {
+AckHandler::~AckHandler() {
 }
 
 }  // namespace syncer