Start consolidating cross-port file selection code into ui/base/dialogs.

chrome/browser/ui/base_shell_dialog.h

Index: chrome/browser/ui/base_shell_dialog.h
diff --git a/chrome/browser/ui/base_shell_dialog.h b/chrome/browser/ui/base_shell_dialog.h
deleted file mode 100644
index 4a5a99c1ab2056f7625cf86a56f773a56036f568..0000000000000000000000000000000000000000
--- a/chrome/browser/ui/base_shell_dialog.h
+++ /dev/null
@@ -1,26 +0,0 @@
-// 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.
-
-#ifndef CHROME_BROWSER_UI_BASE_SHELL_DIALOG_H_
-#define CHROME_BROWSER_UI_BASE_SHELL_DIALOG_H_
-#pragma once
-
-#include "ui/gfx/native_widget_types.h"
-
-// A base class for shell dialogs.
-class BaseShellDialog {
- public:
-  // Returns true if a shell dialog box is currently being shown modally
-  // to the specified owner.
-  virtual bool IsRunning(gfx::NativeWindow owning_window) const = 0;
-
-  // Notifies the dialog box that the listener has been destroyed and it should
-  // no longer be sent notifications.
-  virtual void ListenerDestroyed() = 0;
-
- protected:
-  virtual ~BaseShellDialog() {}
-};
-
-#endif  // CHROME_BROWSER_UI_BASE_SHELL_DIALOG_H_