linux and chromeos: Turn on -Wunused-const-variable.

chrome/browser/ui/webui/chromeos/network_ui.cc

 // Copyright 2013 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/ui/webui/chromeos/network_ui.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 12 matching lines @@
 
 namespace chromeos {
 
 namespace {
 
 const char kStringsJsFile[] = "strings.js";
 const char kRequestNetworkInfoCallback[] = "requestNetworkInfo";
 const char kNetworkEventLogTag[] = "networkEventLog";
 const char kNetworkStateTag[] = "networkState";
 const char kOnNetworkInfoReceivedFunction[] = "NetworkUI.onNetworkInfoReceived";
-const char kLevelDebugTag[] = "Debug";
 
 class NetworkMessageHandler : public content::WebUIMessageHandler {
  public:
   NetworkMessageHandler();
   virtual ~NetworkMessageHandler();
 
   // WebUIMessageHandler implementation.
   virtual void RegisterMessages() OVERRIDE;
 
  private:
@@ skipping 87 matching lines @@
   html->SetDefaultResource(IDR_NETWORK_HTML);
 
   Profile* profile = Profile::FromWebUI(web_ui);
   content::WebUIDataSource::Add(profile, html);
 }
 
 NetworkUI::~NetworkUI() {
 }
 
 }  // namespace chromeos