Move file_dialog and message_box to browser/ui.

browser/ui/message_box.h

@@ -0,0 +1,30 @@
+// Copyright (c) 2013 GitHub, Inc. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BROWSER_UI_MESSAGE_BOX_H_
+#define BROWSER_UI_MESSAGE_BOX_H_
+
+#include <string>
+#include <vector>
+
+namespace atom {
+
+class NativeWindow;
+
+enum MessageBoxType {
+  MESSAGE_BOX_TYPE_NONE = 0,
+  MESSAGE_BOX_TYPE_INFORMATION,
+  MESSAGE_BOX_TYPE_WARNING
+};
+
+int ShowMessageBox(NativeWindow* parent_window,
+                   MessageBoxType type,
+                   const std::vector<std::string>& buttons,
+                   const std::string& title,
+                   const std::string& message,
+                   const std::string& detail);
+
+}  // namespace atom
+
+#endif  // BROWSER_UI_MESSAGE_BOX_H_