Remove ImageSkia::empty and ImageSkia::extractSubset

ui/app_list/app_list_item_view.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 "ui/app_list/app_list_item_view.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/message_loop.h"
@@ skipping 168 matching lines @@
   UpdateIcon();
 }
 
 void AppListItemView::UpdateIcon() {
   // Skip if |icon_size_| has not been determined.
   if (icon_size_.IsEmpty())
     return;
 
   gfx::ImageSkia icon = model_->icon();
   // Clear icon and bail out if model icon is empty.
-  if (icon.empty()) {
+  if (icon.isNull()) {
     icon_->SetImage(NULL);
     return;
   }
 
   CancelPendingIconOperation();
 
   gfx::ImageSkia shadow;
   if (IconCache::GetInstance()->Get(icon, icon_size_, &shadow)) {
     icon_->SetImage(shadow);
   } else {
@@ skipping 108 matching lines @@
     apps_grid_view_->SetSelectedItem(this);
     title_->SetEnabledColor(kTitleHoverColor);
   } else {
     apps_grid_view_->ClearSelectedItem(this);
     model_->SetHighlighted(false);
     title_->SetEnabledColor(kTitleColor);
   }
 }
 
 }  // namespace app_list