Get main frame and subframe AppCache loads to work.

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 2159d159372e2884a36701f787416391d5f2a7d9..03078539e74eacdb149403d2fe7ed37738908274 100644
--- a/content/browser/appcache/appcache_storage_impl.cc
+++ b/content/browser/appcache/appcache_storage_impl.cc
@@ -1779,6 +1779,10 @@ void AppCacheStorageImpl::DeleteResponses(
   StartDeletingResponses(response_ids);
 }
 
+bool AppCacheStorageImpl::IsInitialized() {
+  return IsInitTaskComplete();
+}
+
 void AppCacheStorageImpl::DelayedStartDeletingUnusedResponses() {
   // Only if we haven't already begun.
   if (!did_start_deleting_responses_) {