Remove ImageSkia::empty and ImageSkia::extractSubset

chrome/browser/ui/webui/chromeos/login/network_dropdown.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/ui/webui/chromeos/login/network_dropdown.h"
 
 #include <string>
 
 #include "base/time.h"
 #include "base/values.h"
@@ skipping 146 matching lines @@
 void NetworkDropdown::NetworkMenuIconChanged() {
   SetNetworkIconAndText();
 }
 
 void NetworkDropdown::SetNetworkIconAndText() {
   string16 text;
   const gfx::ImageSkia icon_image = network_icon_->GetIconAndText(&text);
   SkBitmap icon_bitmap = icon_image.GetRepresentation(
       ui::GetScaleFactorFromScale(web_ui_->GetDeviceScale())).sk_bitmap();
   std::string icon_str =
-      icon_image.empty() ?
+      icon_image.isNull() ?
           std::string() : web_ui_util::GetImageDataUrl(icon_bitmap);
   base::StringValue title(text);
   base::StringValue icon(icon_str);
   web_ui_->CallJavascriptFunction("cr.ui.DropDown.updateNetworkTitle",
                                   title, icon);
 }
 
 void NetworkDropdown::ForceNetworkScan() {
   CrosLibrary::Get()->GetNetworkLibrary()->RequestNetworkScan();
   Refresh();
 }
 
 }  // namespace chromeos