Cleanup: Remove unused variables in chrome/ found by Scythe.

chrome/browser/first_run/first_run_internal.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_FIRST_RUN_FIRST_RUN_INTERNAL_H_
 #define CHROME_BROWSER_FIRST_RUN_FIRST_RUN_INTERNAL_H_
 
 class MasterPrefs;
 class Profile;
 
 namespace base {
 class FilePath;
 }
 
 namespace installer {
 class MasterPreferences;
 }
 
 namespace first_run {
 
 namespace internal {
 
 enum FirstRunState {
   FIRST_RUN_UNKNOWN,  // The state is not tested or set yet.
   FIRST_RUN_TRUE,
   FIRST_RUN_FALSE,
 };
 
-// This variable should only be accessed through IsChromeFirstRun().
-extern FirstRunState first_run_;
-
 // Sets up master preferences by preferences passed by installer.
 void SetupMasterPrefsFromInstallPrefs(
     const installer::MasterPreferences& install_prefs,
     MasterPrefs* out_prefs);
 
 // Get the file path of the first run sentinel; returns false on failure.
 bool GetFirstRunSentinelFilePath(base::FilePath* path);
 
 // Create the first run sentinel file; returns false on failure.
 bool CreateSentinel();
@@ skipping 15 matching lines @@
 // should exit.
 bool ShowPostInstallEULAIfNeeded(installer::MasterPreferences* install_prefs);
 
 // Returns the path for the master preferences file.
 base::FilePath MasterPrefsPath();
 
 }  // namespace internal
 }  // namespace first_run
 
 #endif  // CHROME_BROWSER_FIRST_RUN_FIRST_RUN_INTERNAL_H_