Remove unused fields from //content.

content/browser/appcache/appcache_service_impl.cc

 // Copyright 2014 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 "content/browser/appcache/appcache_service_impl.h"
 
 #include <functional>
 #include <utility>
 
 #include "base/bind.h"
@@ skipping 313 matching lines @@
     } else {
       AppCacheHistograms::CountCheckResponseResult(
           AppCacheHistograms::RESPONSE_OUT_OF_DATE);
     }
     delete this;
     return;
   }
 
   // Verify that we can read the response info and data.
   expected_total_size_ = entry->response_size();
-  response_reader_.reset(service_->storage()->CreateResponseReader(
-      manifest_url_, group->group_id(), response_id_));
+  response_reader_.reset(
+      service_->storage()->CreateResponseReader(manifest_url_, response_id_));
   info_buffer_ = new HttpResponseInfoIOBuffer();
   response_reader_->ReadInfo(
       info_buffer_.get(),
       base::Bind(&CheckResponseHelper::OnReadInfoComplete,
                  base::Unretained(this)));
 }
 
 void AppCacheServiceImpl::CheckResponseHelper::OnReadInfoComplete(int result) {
   if (result < 0) {
     AppCacheHistograms::CountCheckResponseResult(
@@ skipping 171 matching lines @@
   backends_.insert(
       BackendMap::value_type(backend_impl->process_id(), backend_impl));
 }
 
 void AppCacheServiceImpl::UnregisterBackend(
     AppCacheBackendImpl* backend_impl) {
   backends_.erase(backend_impl->process_id());
 }
 
 }  // namespace content