Remove the extension install dialog black border.

chrome/browser/ui/views/extensions/extension_install_dialog_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 <vector>
 
 #include "base/basictypes.h"
 #include "base/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/i18n/rtl.h"
@@ skipping 167 matching lines @@
   ui::SlideAnimation slide_animation_;
 
   DISALLOW_COPY_AND_ASSIGN(IssueAdviceView);
 };
 
 void ShowExtensionInstallDialogImpl(
     const ExtensionInstallPrompt::ShowParams& show_params,
     ExtensionInstallPrompt::Delegate* delegate,
     const ExtensionInstallPrompt::Prompt& prompt) {
   DCHECK(content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
-  views::Widget::CreateWindowWithParent(
+  views::DialogDelegate::CreateDialogWidget(
       new ExtensionInstallDialogView(show_params.navigator, delegate, prompt),
-      show_params.parent_window)->Show();
+      NULL, show_params.parent_window)->Show();
 }
 
 }  // namespace
 
 ExtensionInstallDialogView::ExtensionInstallDialogView(
     content::PageNavigator* navigator,
     ExtensionInstallPrompt::Delegate* delegate,
     const ExtensionInstallPrompt::Prompt& prompt)
     : navigator_(navigator),
       delegate_(delegate),
@@ skipping 430 matching lines @@
       rotate.Translate(-arrow_view_->width() / 2.0,
                        -arrow_view_->height() / 2.0);
     }
     arrow_view_->SetTransform(rotate);
   }
 }
 
 void IssueAdviceView::ChildPreferredSizeChanged(views::View* child) {
   owner_->SizeToContents();
 }