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

chrome/common/net/url_request_context_getter.h

Index: chrome/common/net/url_request_context_getter.h
diff --git a/chrome/common/net/url_request_context_getter.h b/chrome/common/net/url_request_context_getter.h
index ade5e1a21b36a457683cb07490b9909c1fa9fa00..0c060e5576cdd021ad82eda6ea3b14ee7f84108d 100644
--- a/chrome/common/net/url_request_context_getter.h
+++ b/chrome/common/net/url_request_context_getter.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.
 
@@ -15,9 +15,9 @@ class MessageLoopProxy;
 
 namespace net {
 class CookieStore;
+class URLRequestContext;
 }
 
-class URLRequestContext;
 struct URLRequestContextGetterTraits;
 
 // Interface for retrieving an URLRequestContext.
@@ -25,7 +25,7 @@ class URLRequestContextGetter
     : public base::RefCountedThreadSafe<URLRequestContextGetter,
                                         URLRequestContextGetterTraits> {
  public:
-  virtual URLRequestContext* GetURLRequestContext() = 0;
+  virtual net::URLRequestContext* GetURLRequestContext() = 0;
 
   // Defaults to GetURLRequestContext()->cookie_store(), but
   // implementations can override it.