startup: Put it in chrome namespace.

chrome/browser/ui/cocoa/obsolete_os.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_UI_COCOA_OBSOLETE_OS_H_
 #define CHROME_BROWSER_UI_COCOA_OBSOLETE_OS_H_
 #pragma once
 
 #include "base/mac/mac_util.h"
 #include "base/string16.h"
 
-namespace browser {
+namespace chrome {
 
 // Returns true if the OS will either be unsupported by future versions of the
 // application in the near future, or if this is the last version of the
 // application that supports the OS.
 inline bool IsOSObsoleteOrNearlySo() {
   return base::mac::IsOSLeopardOrEarlier();
 }
 
 // Returns a localized string informing users that their OS will either soon
 // be unsupported by future versions of the application, or that they are
 // already using the last version of the application that supports their OS.
 // Do not use the returned string unless IsOSObsoleteOrNearlySo() returns
 // true.
 string16 LocalizedObsoleteOSString();
 
-}  // namespace browser
+}  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_COCOA_OBSOLETE_OS_H_