Add InvalidationStateTracker::Forget() to erase an entry from storage.

sync/tools/sync_listen_notifications.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <cstddef>
 #include <cstdio>
 #include <string>
 
 #include "base/at_exit.h"
 #include "base/base64.h"
@@ skipping 82 matching lines @@
     return InvalidationVersionMap();
   }
 
   virtual void SetMaxVersion(
       const invalidation::ObjectId& id,
       int64 max_invalidation_version) OVERRIDE {
     LOG(INFO) << "Setting max invalidation version for "
               << ObjectIdToString(id) << " to " << max_invalidation_version;
   }
 
+  virtual void Forget(const ObjectIdSet& ids) OVERRIDE {
+    for (ObjectIdSet::const_iterator it = ids.begin(); it != ids.end(); ++it) {
+      LOG(INFO) << "Forgetting saved state for " << ObjectIdToString(*it);
+    }
+  }
+
   virtual std::string GetInvalidationState() const OVERRIDE {
     return std::string();
   }
 
   virtual void SetInvalidationState(const std::string& state) OVERRIDE {
     std::string base64_state;
     CHECK(base::Base64Encode(state, &base64_state));
     LOG(INFO) << "Setting invalidation state to: " << base64_state;
   }
 };
@@ skipping 142 matching lines @@
   io_thread.Stop();
   return 0;
 }
 
 }  // namespace
 }  // namespace syncer
 
 int main(int argc, char* argv[]) {
   return syncer::SyncListenNotificationsMain(argc, argv);
 }