Expire appcaches that fail to update for "too long".

content/browser/appcache/appcache_storage.h

Index: content/browser/appcache/appcache_storage.h
diff --git a/content/browser/appcache/appcache_storage.h b/content/browser/appcache/appcache_storage.h
index 854b0d1da4782567798630e6b129147eb4d5b75f..41668cbca4a9a4194fc76a6bb21b8fa8f8557ec5 100644
--- a/content/browser/appcache/appcache_storage.h
+++ b/content/browser/appcache/appcache_storage.h
@@ -151,6 +151,10 @@ class CONTENT_EXPORT AppCacheStorage {
                                  Delegate* delegate,
                                  int response_code) = 0;
 
+  // Schedules a task to update persistent storage with the times of the first
+  // evictable error and last successful full update check.
+  virtual void StoreEvictionTimes(AppCacheGroup* group) = 0;
+
   // Cancels all pending callbacks for the delegate. The delegate callbacks
   // will not be invoked after, however any scheduled operations will still
   // take place. The callbacks for subsequently scheduled operations are