Remove unused fields from //content.

content/browser/appcache/mock_appcache_storage.cc

Index: content/browser/appcache/mock_appcache_storage.cc
diff --git a/content/browser/appcache/mock_appcache_storage.cc b/content/browser/appcache/mock_appcache_storage.cc
index 5d7cd8d19d9972fd6d1fb78f4994e25cb3cd8419..54eaef89c241a0736637cf58c53d5b8b9d484e6d 100644
--- a/content/browser/appcache/mock_appcache_storage.cc
+++ b/content/browser/appcache/mock_appcache_storage.cc
@@ -165,25 +165,21 @@ void MockAppCacheStorage::StoreEvictionTimes(AppCacheGroup* group) {
 
 AppCacheResponseReader* MockAppCacheStorage::CreateResponseReader(
     const GURL& manifest_url,
-    int64_t group_id,
     int64_t response_id) {
   if (simulated_reader_)
     return simulated_reader_.release();
-  return new AppCacheResponseReader(response_id, group_id,
-                                    disk_cache()->GetWeakPtr());
+  return new AppCacheResponseReader(response_id, disk_cache()->GetWeakPtr());
 }
 
 AppCacheResponseWriter* MockAppCacheStorage::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*
-MockAppCacheStorage::CreateResponseMetadataWriter(int64_t group_id,
-                                                  int64_t response_id) {
-  return new AppCacheResponseMetadataWriter(response_id, group_id,
+MockAppCacheStorage::CreateResponseMetadataWriter(int64_t response_id) {
+  return new AppCacheResponseMetadataWriter(response_id,
                                             disk_cache()->GetWeakPtr());
 }