Fix crash when creating a desktop shortcut for apps with a missing icon.

chrome/browser/ui/webui/extension_icon_source.h

 // Copyright (c) 2011 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_EXTENSION_ICON_SOURCE_H_
 #define CHROME_BROWSER_UI_WEBUI_EXTENSION_ICON_SOURCE_H_
 #pragma once
 
 #include <string>
 
@@ skipping 45 matching lines @@
   virtual ~ExtensionIconSource();
 
   // Gets the URL of the |extension| icon in the given |size|, falling back
   // based on the |match| type. If |grayscale|, the URL will be for the
   // desaturated version of the icon.
   static GURL GetIconURL(const Extension* extension,
                          Extension::Icons icon_size,
                          ExtensionIconSet::MatchType match,
                          bool grayscale);
 
+  // A public utility function for accessing the bitmap of the image specified
+  // by |resource_id|.
+  static SkBitmap* LoadImageByResourceId(int resource_id);
+
   // ChromeURLDataManager::DataSource
 
   virtual std::string GetMimeType(const std::string&) const;
 
   virtual void StartDataRequest(const std::string& path,
                                 bool is_incognito,
                                 int request_id);
 
 
  private:
@@ skipping 75 matching lines @@
   scoped_ptr<SkBitmap> default_app_data_;
 
   scoped_ptr<SkBitmap> default_extension_data_;
 
   CancelableRequestConsumerT<int, 0> cancelable_consumer_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionIconSource);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_EXTENSION_ICON_SOURCE_H_