net: Add namespace net to the remaining files under url_request directory.

net/url_request/url_request_http_job.h

Index: net/url_request/url_request_http_job.h
diff --git a/net/url_request/url_request_http_job.h b/net/url_request/url_request_http_job.h
index 78778c5c2b08980f1f00ef42800f9d3cb25a0661..fbd8baff69ae9f2e637718738a4de159b4cad155 100644
--- a/net/url_request/url_request_http_job.h
+++ b/net/url_request/url_request_http_job.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -18,12 +18,11 @@
 #include "net/url_request/url_request_job.h"
 #include "net/url_request/url_request_throttler_entry_interface.h"
 
-class URLRequestContext;
-
 namespace net {
 
 class HttpResponseInfo;
 class HttpTransaction;
+class URLRequestContext;
 
 // A net::URLRequestJob subclass that is built on top of HttpTransaction.  It
 // provides an implementation for both HTTP and HTTPS.