Add FilePath to base namespace.

chrome/browser/ui/webui/feedback_ui.h

 // 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_WEBUI_FEEDBACK_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_FEEDBACK_UI_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "ui/web_dialogs/web_dialog_ui.h"
 
+namespace base {
 class FilePath;
+}
 
 class FeedbackUI : public ui::WebDialogUI {
  public:
   explicit FeedbackUI(content::WebUI* web_ui);
 
 #if defined(OS_CHROMEOS)
   static void GetMostRecentScreenshots(
-      const FilePath& filepath,
+      const base::FilePath& filepath,
       std::vector<std::string>* saved_screenshots,
       size_t max_saved);
 #endif
 
  private:
   DISALLOW_COPY_AND_ASSIGN(FeedbackUI);
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_FEEDBACK_UI_H_