Bug 1274585 - Push HTTP cache index build when asked for disk cache size, r=michal

netwerk/cache2/CacheIndex.h

@@ -835,6 +835,7 @@ private:
   // Following methods perform updating and building of the index.
   // Timer callback that starts update or build process.
   static void DelayedUpdate(nsITimer *aTimer, void *aClosure);
+  void DelayedUpdateLocked();
   // Posts timer event that start update or build process.
   nsresult ScheduleUpdateTimer(uint32_t aDelay);
   nsresult SetupDirectoryEnumerator();