Remove ImageSkia::empty and ImageSkia::extractSubset

chrome/browser/ui/webui/chromeos/login/user_image_screen_handler.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/user_image_screen_handler.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/logging.h"
@@ skipping 250 matching lines @@
   }
 }
 
 void UserImageScreenHandler::HandleImageAccepted(const base::ListValue* args) {
   DCHECK(args && args->empty());
   if (!screen_)
     return;
   switch (selected_image_) {
     case User::kExternalImageIndex:
       // Photo decoding may not have been finished yet.
-      if (user_photo_.empty())
+      if (user_photo_.isNull())
         accept_photo_after_decoding_ = true;
       else
         screen_->OnPhotoTaken(user_photo_);
       break;
 
     case User::kProfileImageIndex:
       screen_->OnProfileImageSelected();
       break;
 
     default:
@@ skipping 24 matching lines @@
   user_photo_ = gfx::ImageSkia(decoded_image);
   if (screen_ && accept_photo_after_decoding_)
     screen_->OnPhotoTaken(user_photo_);
 }
 
 void UserImageScreenHandler::OnDecodeImageFailed(const ImageDecoder* decoder) {
   NOTREACHED() << "Failed to decode PNG image from WebUI";
 }
 
 }  // namespace chromeos