Implement delete methods for the various CannedBrowsingDataHelpers.

chrome/browser/browsing_data/browsing_data_appcache_helper.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 "chrome/browser/browsing_data/browsing_data_appcache_helper.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "chrome/browser/browsing_data/browsing_data_helper.h"
 #include "chrome/browser/profiles/profile.h"
@@ skipping 135 matching lines @@
 const BrowsingDataAppCacheHelper::OriginAppCacheInfoMap&
 CannedBrowsingDataAppCacheHelper::GetOriginAppCacheInfoMap() const {
   return info_collection_->infos_by_origin;
 }
 
 void CannedBrowsingDataAppCacheHelper::StartFetching(
     const base::Closure& completion_callback) {
   completion_callback.Run();
 }
 
+void CannedBrowsingDataAppCacheHelper::DeleteAppCacheGroup(
+    const GURL& manifest_url) {
+  info_collection_->infos_by_origin.erase(manifest_url.GetOrigin());
+  BrowsingDataAppCacheHelper::DeleteAppCacheGroup(manifest_url);
+}
+
 CannedBrowsingDataAppCacheHelper::~CannedBrowsingDataAppCacheHelper() {}