Get main frame and subframe AppCache loads to work.

content/browser/loader/navigation_url_loader_network_service.cc

Index: content/browser/loader/navigation_url_loader_network_service.cc
diff --git a/content/browser/loader/navigation_url_loader_network_service.cc b/content/browser/loader/navigation_url_loader_network_service.cc
index f32156a4074b47cda6e106d7ed12dbfde21c131b..f517c4ebdad72b33a1a67969b3eab7ed4127ba50 100644
--- a/content/browser/loader/navigation_url_loader_network_service.cc
+++ b/content/browser/loader/navigation_url_loader_network_service.cc
@@ -9,6 +9,8 @@
 #include "base/memory/ptr_util.h"
 #include "base/trace_event/trace_event.h"
 #include "content/browser/appcache/appcache_navigation_handle.h"
+#include "content/browser/appcache/appcache_navigation_handle_core.h"
+#include "content/browser/appcache/appcache_url_loader_factory.h"
 #include "content/browser/blob_storage/chrome_blob_storage_context.h"
 #include "content/browser/frame_host/frame_tree_node.h"
 #include "content/browser/frame_host/navigation_request_info.h"
@@ -107,6 +109,9 @@ void PrepareNavigationStartOnIO(
     } else {
       if (appcache_handle_core) {
         factory = url_loader_factory_getter->GetAppCacheFactory()->get();
+        // TODO(ananta)
+        // Change this when we don't use URLLoaderFactories in the browser.
+        AppCacheURLLoaderFactory::SetAppCacheHost(appcache_handle_core->host());
       } else {
         factory = url_loader_factory_getter->GetNetworkFactory()->get();
       }