Make chrome/browser/chrome_browser_main_linux.* Linux-only.

chrome/browser/chrome_browser_main_posix.h

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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_BROWSER_CHROME_MAIN_POSIX_H_
-#define CHROME_BROWSER_BROWSER_CHROME_MAIN_POSIX_H_
+#ifndef CHROME_BROWSER_CHROME_BROWSER_MAIN_POSIX_H_
+#define CHROME_BROWSER_CHROME_BROWSER_MAIN_POSIX_H_
 
 #include "chrome/browser/chrome_browser_main.h"
 
 class ChromeBrowserMainPartsPosix : public ChromeBrowserMainParts {
  public:
   explicit ChromeBrowserMainPartsPosix(
       const content::MainFunctionParams& parameters);
 
+  // content::BrowserMainParts overrides.
   virtual void PreEarlyInitialization() OVERRIDE;
   virtual void PostMainMessageLoopStart() OVERRIDE;
+
+  // ChromeBrowserMainParts overrides.
+  virtual void ShowMissingLocaleMessageBox() OVERRIDE;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ChromeBrowserMainPartsPosix);
 };
 
-#endif  // CHROME_BROWSER_BROWSER_CHROME_MAIN_POSIX_H_
+#endif  // CHROME_BROWSER_CHROME_BROWSER_MAIN_POSIX_H_