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

net/proxy/proxy_script_fetcher_impl.h

Index: net/proxy/proxy_script_fetcher_impl.h
diff --git a/net/proxy/proxy_script_fetcher_impl.h b/net/proxy/proxy_script_fetcher_impl.h
index 4461650456ece28ac4304adf12c236a11db9ccfe..bd141f3b11d1333c2414c5c2f641bff9f899cfca 100644
--- a/net/proxy/proxy_script_fetcher_impl.h
+++ b/net/proxy/proxy_script_fetcher_impl.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.
 
@@ -16,11 +16,12 @@
 #include "net/url_request/url_request.h"
 
 class GURL;
-class URLRequestContext;
 class X509Certificate;
 
 namespace net {
 
+class URLRequestContext;
+
 // Implementation of ProxyScriptFetcher that downloads scripts using the
 // specified request context.
 class ProxyScriptFetcherImpl : public ProxyScriptFetcher,