Fix for an "update in progress" DCHECK

chrome/browser/safe_browsing/protocol_manager.h

Index: chrome/browser/safe_browsing/protocol_manager.h
===================================================================
--- chrome/browser/safe_browsing/protocol_manager.h	(revision 22579)
+++ chrome/browser/safe_browsing/protocol_manager.h	(working copy)
@@ -152,6 +152,10 @@
   // Helper function for update completion.
   void UpdateFinished(bool success);
 
+  // A callback that runs if we timeout waiting for a response to an update
+  // request. We use this to properly set our update state.
+  void UpdateResponseTimeout();
+
  private:
   // Main SafeBrowsing interface object.
   SafeBrowsingService* sb_service_;