Get main frame and subframe AppCache loads to work.

content/browser/appcache/appcache_navigation_handle_core.cc

Index: content/browser/appcache/appcache_navigation_handle_core.cc
diff --git a/content/browser/appcache/appcache_navigation_handle_core.cc b/content/browser/appcache/appcache_navigation_handle_core.cc
index 83a6ccf484ba47bd18dadfa80130f28173faf58c..0ee0dcc0b832a4251f2da55edc6835d7735b97ac 100644
--- a/content/browser/appcache/appcache_navigation_handle_core.cc
+++ b/content/browser/appcache/appcache_navigation_handle_core.cc
@@ -50,8 +50,9 @@ AppCacheNavigationHandleCore::~AppCacheNavigationHandleCore() {
 void AppCacheNavigationHandleCore::Initialize() {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
   DCHECK(precreated_host_.get() == nullptr);
-  precreated_host_.reset(
-      new AppCacheHost(appcache_host_id_, this, GetAppCacheService()));
+  precreated_host_.reset(new AppCacheHost(
+      appcache_host_id_, this,
+      static_cast<AppCacheServiceImpl*>(GetAppCacheService())));
 
   DCHECK(g_appcache_handle_map.Get().find(appcache_host_id_) ==
          g_appcache_handle_map.Get().end());
@@ -71,8 +72,8 @@ std::unique_ptr<AppCacheHost> AppCacheNavigationHandleCore::GetPrecreatedHost(
   return std::unique_ptr<AppCacheHost>();
 }
 
-AppCacheServiceImpl* AppCacheNavigationHandleCore::GetAppCacheService() {
-  return static_cast<AppCacheServiceImpl*>(appcache_service_.get());
+ChromeAppCacheService* AppCacheNavigationHandleCore::GetAppCacheService() {
+  return appcache_service_.get();
 }
 
 void AppCacheNavigationHandleCore::OnCacheSelected(int host_id,