AppCache: Remove dead code from AppCacheService

content/public/browser/appcache_service.h

Index: content/public/browser/appcache_service.h
diff --git a/content/public/browser/appcache_service.h b/content/public/browser/appcache_service.h
index 67d1ca6702ec35b69d6ba54fcb5e840f1d9eee7d..7d4da8e303230c1476dfa3b25f11bd9536d851db 100644
--- a/content/public/browser/appcache_service.h
+++ b/content/public/browser/appcache_service.h
@@ -34,13 +34,6 @@ struct CONTENT_EXPORT AppCacheInfoCollection
 // Call these methods only on the IO thread.
 class CONTENT_EXPORT AppCacheService {
  public:
-  // Determines if a request for 'url' can be satisfied while offline.
-  // This method always completes asynchronously.
-  virtual void CanHandleMainResourceOffline(const GURL& url,
-                                            const GURL& first_party,
-                                            const net::CompletionCallback&
-                                            callback) = 0;
-
   // Populates 'collection' with info about all of the appcaches stored
   // within the service, 'callback' is invoked upon completion. The service
   // acquires a reference to the 'collection' until completion.