- Factor platform-specific code out of CefBrowserHostImpl (issue #1749).

- Introduce native/ and osr/ folders for native (non-platform-agnostic) and
    osr (windowless) code respectively.
  - Introduce CefBrowserPlatformDelegate for abstracting platform-specific
    implementations of browser host functionality.
  - Move dialog and menu code to separate manager and platform-specific runner
    implementations exposed via CefBrowserPlatformDelegate.
  - Standardize focus-handling behavior between windowed and windowless
    implementations. CefFocusHandler::OnSetFocus() will now also be called for
    osr focus changes.
- Support multiple simultaneous popups (issue #1289).

libcef/browser/native/file_dialog_runner_win.h

@@ -0,0 +1,22 @@
+// Copyright (c) 2012 The Chromium Embedded Framework Authors.
+// Portions 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 CEF_LIBCEF_BROWSER_NATIVE_FILE_DIALOG_RUNNER_WIN_H_
+#define CEF_LIBCEF_BROWSER_NATIVE_FILE_DIALOG_RUNNER_WIN_H_
+#pragma once
+
+#include "libcef/browser/file_dialog_runner.h"
+
+class CefFileDialogRunnerWin : public CefFileDialogRunner {
+ public:
+  CefFileDialogRunnerWin();
+
+  // CefFileDialogRunner methods:
+  void Run(CefBrowserHostImpl* browser,
+           const FileChooserParams& params,
+           RunFileChooserCallback callback) override;
+};
+
+#endif  // CEF_LIBCEF_BROWSER_NATIVE_FILE_DIALOG_RUNNER_WIN_H_