Ensure that even if the HostResolver outlives the IO thread, its jobs will no...

net/base/host_resolver.h

Index: net/base/host_resolver.h
===================================================================
--- net/base/host_resolver.h	(revision 19453)
+++ net/base/host_resolver.h	(working copy)
@@ -162,6 +162,9 @@
   // Unregisters an observer previously added by AddObserver().
   void RemoveObserver(Observer* observer);
 
+  // TODO(eroman): temp hack for http://crbug.com/15513
+  void Shutdown();
+
  private:
   class Job;
   typedef std::vector<Request*> RequestsList;
@@ -210,6 +213,9 @@
   // Observers are the only consumers of this ID number.
   int next_request_id_;
 
+  // TODO(eroman): temp hack for http://crbug.com/15513
+  bool shutdown_;
+
   DISALLOW_COPY_AND_ASSIGN(HostResolver);
 };