Implement new invalidations ack tracking system

chrome/browser/invalidation/p2p_invalidation_service.h

Index: chrome/browser/invalidation/p2p_invalidation_service.h
diff --git a/chrome/browser/invalidation/p2p_invalidation_service.h b/chrome/browser/invalidation/p2p_invalidation_service.h
index 8a6e3c02f6009ddc2746e4a23b0b4c403199783d..9e6c0235516af58a4ebfd490b5ad9abe0d02d17d 100644
--- a/chrome/browser/invalidation/p2p_invalidation_service.h
+++ b/chrome/browser/invalidation/p2p_invalidation_service.h
@@ -5,7 +5,6 @@
 #include "base/threading/non_thread_safe.h"
 #include "chrome/browser/invalidation/invalidation_service.h"
 #include "components/browser_context_keyed_service/browser_context_keyed_service.h"
-#include "sync/notifier/object_id_invalidation_map.h"
 
 #ifndef CHROME_BROWSER_INVALIDATION_P2P_INVALIDATION_SERVICE_H_
 #define CHROME_BROWSER_INVALIDATION_P2P_INVALIDATION_SERVICE_H_
@@ -40,9 +39,6 @@ class P2PInvalidationService
       const syncer::ObjectIdSet& ids) OVERRIDE;
   virtual void UnregisterInvalidationHandler(
       syncer::InvalidationHandler* handler) OVERRIDE;
-  virtual void AcknowledgeInvalidation(
-      const invalidation::ObjectId& id,
-      const syncer::AckHandle& ack_handle) OVERRIDE;
   virtual syncer::InvalidatorState GetInvalidatorState() const OVERRIDE;
   virtual std::string GetInvalidatorClientId() const OVERRIDE;