Get main frame and subframe AppCache loads to work.

content/browser/appcache/appcache_storage.cc

Index: content/browser/appcache/appcache_storage.cc
diff --git a/content/browser/appcache/appcache_storage.cc b/content/browser/appcache/appcache_storage.cc
index 0299ddc1792fa3dd78317a2f1e82109f0d3b61a8..666acd566225c7100a753746cfba95056c196fb4 100644
--- a/content/browser/appcache/appcache_storage.cc
+++ b/content/browser/appcache/appcache_storage.cc
@@ -18,9 +18,11 @@ namespace content {
 const int64_t AppCacheStorage::kUnitializedId = -1;
 
 AppCacheStorage::AppCacheStorage(AppCacheServiceImpl* service)
-    : last_cache_id_(kUnitializedId), last_group_id_(kUnitializedId),
-      last_response_id_(kUnitializedId), service_(service)  {
-}
+    : last_cache_id_(kUnitializedId),
+      last_group_id_(kUnitializedId),
+      last_response_id_(kUnitializedId),
+      service_(service),
+      weak_factory_(this) {}
 
 AppCacheStorage::~AppCacheStorage() {
   DCHECK(delegate_references_.empty());
@@ -94,6 +96,10 @@ void AppCacheStorage::LoadResponseInfo(const GURL& manifest_url,
   info_load->StartIfNeeded();
 }
 
+base::WeakPtr<AppCacheStorage> AppCacheStorage::GetWeakPtr() {
+  return weak_factory_.GetWeakPtr();
+}
+
 void AppCacheStorage::UpdateUsageMapAndNotify(const GURL& origin,
                                               int64_t new_usage) {
   DCHECK_GE(new_usage, 0);