Allow ProxyService to share URLRequestContext with everything else.

net/proxy/proxy_script_decider.h

Index: net/proxy/proxy_script_decider.h
diff --git a/net/proxy/proxy_script_decider.h b/net/proxy/proxy_script_decider.h
index c4139087d7e74efa699771f2c3468190d79cd526..b3560baa9bdf5eccb1de9ebe150d681da829486c 100644
--- a/net/proxy/proxy_script_decider.h
+++ b/net/proxy/proxy_script_decider.h
@@ -81,6 +81,10 @@ class NET_EXPORT_PRIVATE ProxyScriptDecider {
             bool fetch_pac_bytes,
             const CompletionCallback& callback);
 
+  // Shuts down any in-progress DNS requests, and cancels any ScriptFetcher
+  // requests.  Does not call OnShutdown on the [Dhcp]ProxyScriptFetcher.
+  void OnShutdown();
+
   const ProxyConfig& effective_config() const;
 
   const scoped_refptr<ProxyResolverScriptData>& script_data() const;
@@ -203,7 +207,6 @@ class NET_EXPORT_PRIVATE ProxyScriptDecider {
 
   AddressList wpad_addresses_;
   base::OneShotTimer quick_check_timer_;
-  HostResolver* host_resolver_;
   std::unique_ptr<HostResolver::Request> request_;
   base::Time quick_check_start_time_;