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

chrome/browser/feedback/show_feedback_page.cc

 // Copyright 2014 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 <string>
 
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/api/feedback_private/feedback_private_api.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
@@ skipping 20 matching lines @@
       return target_tab->GetURL();
   }
 
   return GURL();
 }
 
 }  // namespace
 
 namespace chrome {
 
-extern const char kAppLauncherCategoryTag[] = "AppLauncher";
-
 void ShowFeedbackPage(Browser* browser,
                       const std::string& description_template,
                       const std::string& category_tag) {
   GURL page_url;
   if (browser) {
     page_url = GetTargetTabUrl(browser->session_id().id(),
                                browser->tab_strip_model()->active_index());
   }
 
   Profile* profile = NULL;
@@ skipping 27 matching lines @@
 
   extensions::FeedbackPrivateAPI* api =
       extensions::FeedbackPrivateAPI::GetFactoryInstance()->Get(profile);
 
   api->RequestFeedback(description_template,
                        category_tag,
                        page_url);
 }
 
 }  // namespace chrome