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

chrome/common/common_param_traits.h

Index: chrome/common/common_param_traits.h
diff --git a/chrome/common/common_param_traits.h b/chrome/common/common_param_traits.h
index 3638443a024a097ee52f8f8131dbfe122ba4dc7c..ad9c05a49cc9cabd250faf8c35a7b8e9f3e6d98a 100644
--- a/chrome/common/common_param_traits.h
+++ b/chrome/common/common_param_traits.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.
 
@@ -40,7 +40,6 @@ class SkBitmap;
 class DictionaryValue;
 class ListValue;
 struct ThumbnailScore;
-class URLRequestStatus;
 struct WebApplicationInfo;
 class WebCursor;
 
@@ -52,6 +51,7 @@ class Size;
 
 namespace net {
 class UploadData;
+class URLRequestStatus;
 }
 
 namespace printing {