Allow URLRequests from one context to have different NetworkDelegates.

net/url_request/url_request_test_util.cc

Index: net/url_request/url_request_test_util.cc
diff --git a/net/url_request/url_request_test_util.cc b/net/url_request/url_request_test_util.cc
index 3800fec8b76b14cbae10f93b78c5baeb846845ff..fcdae3be217e3ec43c538f2a436a9c0cf1b68a8a 100644
--- a/net/url_request/url_request_test_util.cc
+++ b/net/url_request/url_request_test_util.cc
@@ -134,7 +134,7 @@ TestURLRequest::TestURLRequest(const GURL& url,
                                RequestPriority priority,
                                Delegate* delegate,
                                TestURLRequestContext* context)
-    : URLRequest(url, priority, delegate, context) {}
+    : URLRequest(url, priority, delegate, context, NULL, NULL) {}
 
 TestURLRequest::~TestURLRequest() {
 }