Remove bad use of CancelableCallback from BrowingDataAppCacheHelper

chrome/browser/browsing_data/browsing_data_appcache_helper.h

Index: chrome/browser/browsing_data/browsing_data_appcache_helper.h
diff --git a/chrome/browser/browsing_data/browsing_data_appcache_helper.h b/chrome/browser/browsing_data/browsing_data_appcache_helper.h
index c03c8405e51e4ac3621a2864184156f544e63c31..44492073871fb8d1687abbc1eba74b2862d09cb0 100644
--- a/chrome/browser/browsing_data/browsing_data_appcache_helper.h
+++ b/chrome/browser/browsing_data/browsing_data_appcache_helper.h
@@ -10,7 +10,6 @@
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "content/public/browser/appcache_service.h"
-#include "net/base/completion_callback.h"
 #include "url/gurl.h"
 
 namespace content {
@@ -46,7 +45,6 @@ class BrowsingDataAppCacheHelper
 
   bool is_fetching_;
   content::AppCacheService* appcache_service_;
-  net::CancelableCompletionCallback appcache_info_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowsingDataAppCacheHelper);
 };