Implement Invalidator::Acknowledge

chrome/browser/sync/profile_sync_service_unittest.cc

Index: chrome/browser/sync/profile_sync_service_unittest.cc
diff --git a/chrome/browser/sync/profile_sync_service_unittest.cc b/chrome/browser/sync/profile_sync_service_unittest.cc
index 7c8a48080d6b48247c84b80af600d3feaaeb8f97..1b29074415b6f074f532ff4447123049ff512f3a 100644
--- a/chrome/browser/sync/profile_sync_service_unittest.cc
+++ b/chrome/browser/sync/profile_sync_service_unittest.cc
@@ -547,6 +547,11 @@ class ProfileSyncServiceInvalidator : public syncer::Invalidator {
     service_->UnregisterInvalidationHandler(handler);
   }
 
+  virtual void Acknowledge(const invalidation::ObjectId& id,
+                           const syncer::AckHandle& ack_handle) OVERRIDE {
+    // Do nothing.
+  }
+
   virtual syncer::InvalidatorState GetInvalidatorState() const OVERRIDE {
     return service_->GetInvalidatorState();
   }