Add explicit base to FilePath.

content/shell/shell_message_filter.h

 // Copyright (c) 2013 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 CONTENT_SHELL_SHELL_MESSAGE_FILTER_H_
 #define CONTENT_SHELL_SHELL_MESSAGE_FILTER_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/file_path.h"
 #include "content/public/browser/browser_message_filter.h"
 
 namespace content {
 
 class ShellMessageFilter : public BrowserMessageFilter {
  public:
   explicit ShellMessageFilter(int render_process_id);
 
  private:
   virtual ~ShellMessageFilter();
 
   // BrowserMessageFilter implementation.
   virtual bool OnMessageReceived(const IPC::Message& message,
                                  bool* message_was_ok) OVERRIDE;
 
-  void OnReadFileToString(const FilePath& local_file, std::string* contents);
+  void OnReadFileToString(const base::FilePath& local_file,
+                          std::string* contents);
   void OnRegisterIsolatedFileSystem(
-      const std::vector<FilePath>& absolute_filenames,
+      const std::vector<base::FilePath>& absolute_filenames,
       std::string* filesystem_id);
 
   int render_process_id_;
 
   DISALLOW_COPY_AND_ASSIGN(ShellMessageFilter);
 };
 
 }  // namespace content
 
 #endif // CONTENT_SHELL_SHELL_MESSAGE_FILTER_H_