Poll PAC scripts for content changes.

net/proxy/mock_proxy_resolver.h

Index: net/proxy/mock_proxy_resolver.h
diff --git a/net/proxy/mock_proxy_resolver.h b/net/proxy/mock_proxy_resolver.h
index bf1b4a96d64456cf0cc8d6187a01d5c6cc9db4d0..02a06585fc4b5282adf75421be2ffbeb43774636 100644
--- a/net/proxy/mock_proxy_resolver.h
+++ b/net/proxy/mock_proxy_resolver.h
@@ -94,6 +94,10 @@ class MockAsyncProxyResolverBase : public ProxyResolver {
 
   SetPacScriptRequest* pending_set_pac_script_request() const;
 
+  bool has_pending_set_pac_script_request() const {
+    return pending_set_pac_script_request_.get() != NULL;
+  }
+
   void RemovePendingRequest(Request* request);
 
   void RemovePendingSetPacScriptRequest(SetPacScriptRequest* request);