Remove the external protocol dialog black border.

chrome/browser/ui/views/external_protocol_dialog.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/views/external_protocol_dialog.h"
 
 #include "base/metrics/histogram.h"
 #include "base/string_util.h"
 #include "base/threading/thread.h"
 #include "base/threading/thread_restrictions.h"
@@ skipping 136 matching lines @@
       elided_command) + ASCIIToUTF16("\n\n");
 
   message_text += l10n_util::GetStringUTF16(IDS_EXTERNAL_PROTOCOL_WARNING);
 
   views::MessageBoxView::InitParams params(message_text);
   params.message_width = kMessageWidth;
   message_box_view_ = new views::MessageBoxView(params);
   message_box_view_->SetCheckBoxLabel(
       l10n_util::GetStringUTF16(IDS_EXTERNAL_PROTOCOL_CHECKBOX_TEXT));
 
-  HWND root_hwnd;
+  // Dialog is top level if we don't have a web_contents associated with us.
+  HWND root_hwnd = NULL;
   if (web_contents_) {
     root_hwnd = GetAncestor(web_contents_->GetView()->GetContentNativeView(),
                             GA_ROOT);
-  } else {
-    // Dialog is top level if we don't have a web_contents associated with us.
-    root_hwnd = NULL;
   }
 
-  views::Widget::CreateWindowWithParent(this, root_hwnd)->Show();
+  views::DialogDelegate::CreateDialogWidget(this, NULL, root_hwnd)->Show();
 }
 
 // static
 std::wstring ExternalProtocolDialog::GetApplicationForProtocol(
     const GURL& url) {
   // We shouldn't be accessing the registry from the UI thread, since it can go
   // to disk.  http://crbug.com/61996
   base::ThreadRestrictions::ScopedAllowIO allow_io;
 
   std::wstring url_spec = ASCIIToWide(url.possibly_invalid_spec());
   std::wstring cmd_key_path =
       ASCIIToWide(url.scheme() + "\\shell\\open\\command");
   base::win::RegKey cmd_key(HKEY_CLASSES_ROOT, cmd_key_path.c_str(), KEY_READ);
   size_t split_offset = url_spec.find(L':');
   if (split_offset == std::wstring::npos)
     return std::wstring();
   std::wstring parameters = url_spec.substr(split_offset + 1,
                                             url_spec.length() - 1);
   std::wstring application_to_launch;
   if (cmd_key.ReadValue(NULL, &application_to_launch) == ERROR_SUCCESS) {
     ReplaceSubstringsAfterOffset(&application_to_launch, 0, L"%1", parameters);
     return application_to_launch;
   } else {
     return std::wstring();
   }
 }