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

net/url_request/url_request_simple_job.cc

Index: net/url_request/url_request_simple_job.cc
diff --git a/net/url_request/url_request_simple_job.cc b/net/url_request/url_request_simple_job.cc
index 538dcf1fbd657e7b027358281386ed5168b05728..00ce7616fc3d1cf3580d8786db6fcf2302922b8a 100644
--- a/net/url_request/url_request_simple_job.cc
+++ b/net/url_request/url_request_simple_job.cc
@@ -9,12 +9,14 @@
 #include "base/message_loop.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
+#include "net/url_request/url_request.h"
+#include "net/url_request/url_request_context.h"
 #include "net/url_request/url_request_status.h"
 
 namespace net {
 
 URLRequestSimpleJob::URLRequestSimpleJob(URLRequest* request)
-    : URLRequestJob(request),
+    : URLRequestJob(request, request->context()->network_delegate()),
       data_offset_(0),
       ALLOW_THIS_IN_INITIALIZER_LIST(weak_factory_(this)) {}