Clean up a few more unused globals.

chrome/browser/extensions/tab_helper.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/extensions/tab_helper.h"
 
 #include "base/logging.h"
 #include "base/strings/string_util.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/extensions/activity_log/activity_log.h"
@@ skipping 43 matching lines @@
 #include "extensions/common/extension_urls.h"
 #include "ui/gfx/image/image.h"
 
 using content::NavigationController;
 using content::NavigationEntry;
 using content::RenderViewHost;
 using content::WebContents;
 
 DEFINE_WEB_CONTENTS_USER_DATA_KEY(extensions::TabHelper);
 
-namespace {
-
-const char kPermissionError[] = "permission_error";
-
-}  // namespace
-
 namespace extensions {
 
 TabHelper::ScriptExecutionObserver::ScriptExecutionObserver(
     TabHelper* tab_helper)
     : tab_helper_(tab_helper) {
   tab_helper_->AddScriptExecutionObserver(this);
 }
 
 TabHelper::ScriptExecutionObserver::ScriptExecutionObserver()
     : tab_helper_(NULL) {
@@ skipping 404 matching lines @@
   }
 }
 
 void TabHelper::SetTabId(RenderViewHost* render_view_host) {
   render_view_host->Send(
       new ExtensionMsg_SetTabId(render_view_host->GetRoutingID(),
                                 SessionID::IdForTab(web_contents())));
 }
 
 }  // namespace extensions