Remove unused fields from //content.

content/browser/appcache/appcache_storage_impl.cc

Index: content/browser/appcache/appcache_storage_impl.cc
diff --git a/content/browser/appcache/appcache_storage_impl.cc b/content/browser/appcache/appcache_storage_impl.cc
index a83180bd2677203e7fe3223ee7cc50e976f76d5e..f6eeab7348e4ae96f4e3cb4f782bd49cc253f1bb 100644
--- a/content/browser/appcache/appcache_storage_impl.cc
+++ b/content/browser/appcache/appcache_storage_impl.cc
@@ -1734,23 +1734,19 @@ void AppCacheStorageImpl::StoreEvictionTimes(AppCacheGroup* group) {
 
 AppCacheResponseReader* AppCacheStorageImpl::CreateResponseReader(
     const GURL& manifest_url,
-    int64_t group_id,
     int64_t response_id) {
-  return new AppCacheResponseReader(response_id, group_id,
-                                    disk_cache()->GetWeakPtr());
+  return new AppCacheResponseReader(response_id, disk_cache()->GetWeakPtr());
 }
 
 AppCacheResponseWriter* AppCacheStorageImpl::CreateResponseWriter(
-    const GURL& manifest_url,
-    int64_t group_id) {
-  return new AppCacheResponseWriter(NewResponseId(), group_id,
+    const GURL& manifest_url) {
+  return new AppCacheResponseWriter(NewResponseId(),
                                     disk_cache()->GetWeakPtr());
 }
 
 AppCacheResponseMetadataWriter*
-AppCacheStorageImpl::CreateResponseMetadataWriter(int64_t group_id,
-                                                  int64_t response_id) {
-  return new AppCacheResponseMetadataWriter(response_id, group_id,
+AppCacheStorageImpl::CreateResponseMetadataWriter(int64_t response_id) {
+  return new AppCacheResponseMetadataWriter(response_id,
                                             disk_cache()->GetWeakPtr());
 }