Decouple URLRequestJob from URLRequestContext; access NetworkDelegate as a contructor parameter.

net/url_request/url_request_about_job.cc

Index: net/url_request/url_request_about_job.cc
diff --git a/net/url_request/url_request_about_job.cc b/net/url_request/url_request_about_job.cc
index f305909638340093241c59f73fd4cc913f6afbcc..949deaf95eb7124807163fdab379daffdbcbf2ff 100644
--- a/net/url_request/url_request_about_job.cc
+++ b/net/url_request/url_request_about_job.cc
@@ -11,11 +11,13 @@
 #include "base/bind.h"
 #include "base/compiler_specific.h"
 #include "base/message_loop.h"
+#include "net/url_request/url_request.h"
+#include "net/url_request/url_request_context.h"
 
 namespace net {
 
 URLRequestAboutJob::URLRequestAboutJob(URLRequest* request)
-    : URLRequestJob(request),
+    : URLRequestJob(request, request->context()->network_delegate()),
       ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)) {
 }