Use FilePaths in content::DropData to avoid redundant conversions.

ui/base/dragdrop/file_info.h

+// Copyright 2014 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 UI_BASE_DRAGDROP_FILE_INFO_H_
+#define UI_BASE_DRAGDROP_FILE_INFO_H_
+
+#include "base/files/file_path.h"
+#include "ui/base/ui_base_export.h"
+
+namespace ui {
+
+// struct that bundles a file's path with an optional display name.
+struct UI_BASE_EXPORT FileInfo {
+  FileInfo();
+  FileInfo(const base::FilePath& path, const base::FilePath& display_name);
+  ~FileInfo();
+
+  base::FilePath path;
+  base::FilePath display_name;  // Optional.
+};
+
+}  // namespace ui
+
+#endif  // UI_BASE_DRAGDROP_FILE_INFO_H_