AppCache: Remove dead code from AppCacheService

content/browser/appcache/appcache_service_impl.h

Index: content/browser/appcache/appcache_service_impl.h
diff --git a/content/browser/appcache/appcache_service_impl.h b/content/browser/appcache/appcache_service_impl.h
index 968666636aa9086669dd5634cb3b0d9b6c94b951..d4efb64b233fc11aa18968ecd8d43cad70b99f3e 100644
--- a/content/browser/appcache/appcache_service_impl.h
+++ b/content/browser/appcache/appcache_service_impl.h
@@ -99,10 +99,6 @@ class CONTENT_EXPORT AppCacheServiceImpl
   void ScheduleReinitialize();
 
   // AppCacheService implementation:
-  void CanHandleMainResourceOffline(
-      const GURL& url,
-      const GURL& first_party,
-      const net::CompletionCallback& callback) override;
   void GetAllAppCacheInfo(AppCacheInfoCollection* collection,
                           const net::CompletionCallback& callback) override;
   void DeleteAppCacheGroup(const GURL& manifest_url,
@@ -187,7 +183,6 @@ class CONTENT_EXPORT AppCacheServiceImpl
       ScheduleReinitialize);
 
   class AsyncHelper;
-  class CanHandleOfflineHelper;
   class DeleteHelper;
   class DeleteOriginHelper;
   class GetInfoHelper;