Remove ImageSkia::empty and ImageSkia::extractSubset

ash/launcher/launcher_button.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/launcher/launcher_button.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "ash/launcher/launcher_button_host.h"
@@ skipping 229 matching lines @@
 
 LauncherButton::~LauncherButton() {
 }
 
 void LauncherButton::SetShadowedImage(const gfx::ImageSkia& image) {
   icon_view_->SetImage(gfx::ImageSkiaOperations::CreateImageWithDropShadow(
       image, icon_shadows_));
 }
 
 void LauncherButton::SetImage(const gfx::ImageSkia& image) {
-  if (image.empty()) {
+  if (image.isNull()) {
     // TODO: need an empty image.
     icon_view_->SetImage(image);
     return;
   }
 
   if (icon_view_->icon_size() == 0) {
     SetShadowedImage(image);
     return;
   }
 
@@ skipping 243 matching lines @@
       bar_->SetVerticalAlignment(views::ImageView::CENTER);
       break;
   }
 
   Layout();
   SchedulePaint();
 }
 
 }  // namespace internal
 }  // namespace ash