Remove unused references to NativeTheme in TrayPopupItemStyle.

ash/common/system/chromeos/network/tray_vpn.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 "ash/common/system/chromeos/network/tray_vpn.h"
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "ash/common/session/session_state_delegate.h"
 #include "ash/common/system/chromeos/network/network_icon.h"
 #include "ash/common/system/chromeos/network/network_icon_animation.h"
@@ skipping 100 matching lines @@
   void GetNetworkStateHandlerImageAndLabel(gfx::ImageSkia* image,
                                            base::string16* label,
                                            bool* animating) {
     NetworkStateHandler* handler =
         NetworkHandler::Get()->network_state_handler();
     const NetworkState* vpn =
         handler->FirstNetworkByType(NetworkTypePattern::VPN());
     if (MaterialDesignController::IsSystemTrayMenuMaterial()) {
       *image = gfx::CreateVectorIcon(
           kNetworkVpnIcon, TrayPopupItemStyle::GetIconColor(
-                               GetNativeTheme(),
                                vpn && vpn->IsConnectedState()
                                    ? TrayPopupItemStyle::ColorStyle::ACTIVE
                                    : TrayPopupItemStyle::ColorStyle::INACTIVE));
     } else {
       *image = network_icon::GetVpnImage();
     }
     if (!IsVpnConnected()) {
       if (label) {
         *label =
             l10n_util::GetStringUTF16(IDS_ASH_STATUS_TRAY_VPN_DISCONNECTED);
@@ skipping 71 matching lines @@
 void TrayVPN::UpdateAfterShelfAlignmentChange(ShelfAlignment alignment) {}
 
 void TrayVPN::NetworkStateChanged() {
   if (default_)
     default_->Update();
   if (detailed_)
     detailed_->Update();
 }
 
 }  // namespace ash