Select a more appropiate appcache based on the opener or the parent of the new document.

webkit/appcache/mock_appcache_storage.cc

Index: webkit/appcache/mock_appcache_storage.cc
===================================================================
--- webkit/appcache/mock_appcache_storage.cc	(revision 81647)
+++ webkit/appcache/mock_appcache_storage.cc	(working copy)
@@ -83,9 +83,11 @@
 }
 
 void MockAppCacheStorage::FindResponseForMainRequest(
-    const GURL& url, Delegate* delegate) {
+    const GURL& url, const GURL& preferred_manifest_url, Delegate* delegate) {
   DCHECK(delegate);
 
+  // Note: MockAppCacheStorage does not respect the preferred_manifest_url.
+
   // Always make this operation look async.
   ScheduleTask(method_factory_.NewRunnableMethod(
       &MockAppCacheStorage::ProcessFindResponseForMainRequest,