Fix chrome frame build, take 3.

chrome_frame/chrome_launcher.h

 // Copyright (c) 2009 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_FRAME_CHROME_LAUNCHER_H_
 #define CHROME_FRAME_CHROME_LAUNCHER_H_
 
 #include <string>
 
+#include "base/file_path.h"
+
 class CommandLine;
 
 namespace chrome_launcher {
 
 // The base name of the chrome_launcher.exe file.
 extern const wchar_t kLauncherExeBaseName[];
 
 // Creates a command line suitable for launching Chrome.  You can add any
 // flags needed before launching.
 //
@@ skipping 16 matching lines @@
 
 // Returns the full path to the Chrome executable.
 FilePath GetChromeExecutablePath();
 
 // The type of the CfLaunchChrome entrypoint exported from this DLL.
 typedef int (__stdcall *CfLaunchChromeProc)();
 
 }  // namespace chrome_launcher
 
 #endif  // CHROME_FRAME_CHROME_LAUNCHER_H_