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

sync/notifier/chrome_invalidation_client_unittest.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 <string>
 
 #include "base/message_loop.h"
 #include "google/cacheinvalidation/include/invalidation-client.h"
 #include "google/cacheinvalidation/include/types.h"
 #include "google/cacheinvalidation/types.pb.h"
@@ skipping 261 matching lines @@
 TEST_F(ChromeInvalidationClientTest, InvalidateAll) {
   ObjectIdSet ids;
   ids.insert(kPreferencesId_);
   ids.insert(kExtensionsId_);
   client_.RegisterIds(ids);
   EXPECT_CALL(mock_listener_, OnInvalidate(
       ObjectIdsAndPayloadToMap(ids, std::string())));
   FireInvalidateAll();
 }
 
-TEST_F(ChromeInvalidationClientTest, RegisterTypes) {
+TEST_F(ChromeInvalidationClientTest, RegisterIds) {
   ObjectIdSet ids;
   ids.insert(kPreferencesId_);
   ids.insert(kExtensionsId_);
   client_.RegisterIds(ids);
   // Registered types should be preserved across Stop/Start.
   TearDown();
   SetUp();
   EXPECT_CALL(mock_listener_,OnInvalidate(
       ObjectIdsAndPayloadToMap(ids, std::string())));
   FireInvalidateAll();
@@ skipping 63 matching lines @@
           invalidation::ErrorContext()));
   fake_push_client_->DisableNotifications(
       notifier::TRANSIENT_NOTIFICATION_ERROR);
   fake_push_client_->DisableNotifications(
       notifier::NOTIFICATION_CREDENTIALS_REJECTED);
   fake_push_client_->EnableNotifications();
   client_.Ready(NULL);
 }
 
 }  // namespace syncer