Linux/ChromeOS Chromium style checker cleanup, chrome/browser edition.

chrome/browser/chrome_browser_main_posix.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/chrome_browser_main_posix.h"
 
 #include <errno.h>
 #include <limits.h>
 #include <pthread.h>
 #include <signal.h>
@@ skipping 137 matching lines @@
   browser::ExitCleanly();
 #else
   browser::AttemptExit();
 #endif
 }
 
 class ShutdownDetector : public base::PlatformThread::Delegate {
  public:
   explicit ShutdownDetector(int shutdown_fd);
 
-  virtual void ThreadMain();
+  virtual void ThreadMain() OVERRIDE;
 
  private:
   const int shutdown_fd_;
 
   DISALLOW_COPY_AND_ASSIGN(ShutdownDetector);
 };
 
 ShutdownDetector::ShutdownDetector(int shutdown_fd)
     : shutdown_fd_(shutdown_fd) {
   CHECK_NE(shutdown_fd_, -1);
@@ skipping 186 matching lines @@
   ChromeBrowserMainExtraPartsGtk::ShowMessageBox(
       chrome_browser::kMissingLocaleDataMessage);
 #elif defined(USE_AURA)
   // TODO(port): We may want a views based message dialog here eventually, but
   // for now, crash.
   NOTREACHED();
 #else
 #error "Need MessageBox implementation."
 #endif
 }