Add support for subresource request loads in AppCache for the network service.

content/browser/appcache/appcache_host.cc

Index: content/browser/appcache/appcache_host.cc
diff --git a/content/browser/appcache/appcache_host.cc b/content/browser/appcache/appcache_host.cc
index 3af81c5eef57a9a55e8d38147f0ef6ffa3f3d95a..526d72f1ea15d289547b4c5fb1e10fb8d1de534e 100644
--- a/content/browser/appcache/appcache_host.cc
+++ b/content/browser/appcache/appcache_host.cc
@@ -58,7 +58,8 @@ AppCacheHost::AppCacheHost(int host_id, AppCacheFrontend* frontend,
       pending_callback_param_(NULL),
       main_resource_was_namespace_entry_(false),
       main_resource_blocked_(false),
-      associated_cache_info_pending_(false) {
+      associated_cache_info_pending_(false),
+      weak_factory_(this) {
   service_->AddObserver(this);
 }
 
@@ -543,6 +544,10 @@ void AppCacheHost::CompleteTransfer(int host_id, AppCacheFrontend* frontend) {
   frontend_ = frontend;
 }
 
+base::WeakPtr<AppCacheHost> AppCacheHost::GetWeakPtr() {
+  return weak_factory_.GetWeakPtr();
+}
+
 void AppCacheHost::AssociateNoCache(const GURL& manifest_url) {
   // manifest url can be empty.
   AssociateCacheHelper(NULL, manifest_url);