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

net/ocsp/nss_ocsp.h

Index: net/ocsp/nss_ocsp.h
diff --git a/net/ocsp/nss_ocsp.h b/net/ocsp/nss_ocsp.h
index cf2e66e7fe8829692ed91063a6021975840072ce..fae7a87a5f90e286e9842a068dbc77d4f65bf608 100644
--- a/net/ocsp/nss_ocsp.h
+++ b/net/ocsp/nss_ocsp.h
@@ -1,4 +1,4 @@
-// Copyright (c) 2009 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.
 
@@ -6,10 +6,10 @@
 #define NET_OCSP_NSS_OCSP_H_
 #pragma once
 
-class URLRequestContext;
-
 namespace net {
 
+class URLRequestContext;
+
 // Sets the MessageLoop for OCSP to the current message loop.
 // This should be called before EnsureOCSPInit() if you want to
 // control the message loop for OCSP.