Check for null widget in DragDownload which is causing the crash in the bug.

chrome/browser/download/download_util.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.
 //
 // Download utility implementation
 
 #include "chrome/browser/download/download_util.h"
 
 #if defined(OS_WIN)
 #include <shobjidl.h>
@@ skipping 380 matching lines @@
     net::GetMimeTypeFromFile(full_path, &mime_type);
 
   // Add URL so that we can load supported files when dragged to WebContents.
   if (net::IsSupportedMimeType(mime_type)) {
     data.SetURL(net::FilePathToFileURL(full_path),
                 download->GetFileNameToReportUser().LossyDisplayName());
   }
 
 #if !defined(TOOLKIT_USES_GTK)
   views::Widget* widget = views::Widget::GetWidgetForNativeView(view);
+  // TODO(varunjain): Widget should not be NULL here. But its causing the crash
+  // in http://code.google.com/p/chromium/issues/detail?id=120430 Find out why.
+  if (!widget || !widget->native_widget())
+    return;
+
   gfx::Point location = gfx::Screen::GetCursorScreenPoint();
   // We do not care about notifying the DragItemView on completion of drag. So
   // we pass NULL to RunShellDrag for the source view.
   widget->RunShellDrag(NULL, data, location,
       ui::DragDropTypes::DRAG_COPY | ui::DragDropTypes::DRAG_LINK);
 
 #else
   GtkWidget* root = gtk_widget_get_toplevel(view);
   if (!root)
     return;
@@ skipping 225 matching lines @@
   UMA_HISTOGRAM_ENUMERATION(
       "Download.CountsChrome", type, CHROME_DOWNLOAD_COUNT_TYPES_LAST_ENTRY);
 }
 
 void RecordDownloadSource(ChromeDownloadSource source) {
   UMA_HISTOGRAM_ENUMERATION(
       "Download.SourcesChrome", source, CHROME_DOWNLOAD_SOURCE_LAST_ENTRY);
 }
 
 }  // namespace download_util