startup: Put it in chrome namespace.

chrome/browser/ui/startup/obsolete_os_prompt_gtk.cc

 // 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.
 
 #include "chrome/browser/ui/startup/obsolete_os_prompt.h"
 
 #include "base/logging.h"
 #include "chrome/browser/infobars/infobar_tab_helper.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_tabstrip.h"
 #include "chrome/browser/ui/gtk/gtk_util.h"
 #include "chrome/browser/ui/startup/obsolete_os_info_bar.h"
 #include "chrome/browser/ui/tab_contents/tab_contents.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "ui/base/l10n/l10n_util.h"
 
-namespace browser {
+namespace chrome {
 
 void ShowObsoleteOSPrompt(Browser* browser) {
   // We've deprecated support for Ubuntu Hardy.  Rather than attempting to
   // determine whether you're using that, we instead key off the GTK version;
   // this will also deprecate other distributions (including variants of Ubuntu)
   // that are of a similar age.
   // Version key:
   //   Ubuntu Hardy: GTK 2.12
   //   RHEL 6:       GTK 2.18
   //   Ubuntu Lucid: GTK 2.20
   if (gtk_check_version(2, 18, 0)) {
     string16 message = l10n_util::GetStringUTF16(IDS_SYSTEM_OBSOLETE_MESSAGE);
     // Link to an article in the help center on minimum system requirements.
     const char* kLearnMoreURL =
         "http://www.google.com/support/chrome/bin/answer.py?answer=95411";
     TabContents* tab = chrome::GetActiveTabContents(browser);
     if (!tab)
       return;
     tab->infobar_tab_helper()->AddInfoBar(
         new ObsoleteOSInfoBar(tab->infobar_tab_helper(),
                               message,
                               GURL(kLearnMoreURL)));
   }
 }
 
-}  // namespace browser
+}  // namespace chrome