Re-try r29078: Remove some deprecated file_util wstring functions.

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.
 //
 // The command-line may use the Chrome executable directly, or use an in-between
 // process if needed for security/elevation purposes.  You must delete the
 // returned command line.
 CommandLine* CreateLaunchCommandLine();
 
 // Fills in a new command line from the flags on this process's command line
 // that we are allowing Low Integrity to invoke.
 //
 // Logs a warning for any flags that were passed that are not allowed to be
 // invoked by Low Integrity.
 void SanitizeCommandLine(const CommandLine& original, CommandLine* sanitized);
 
 // Given a command-line without an initial program part, launch our associated
-// chrome.exe with a sanitized version of that command line. Returns true iff 
+// chrome.exe with a sanitized version of that command line. Returns true iff
 // successful.
 bool SanitizeAndLaunchChrome(const wchar_t* command_line);
 
 // Returns the full path to the Chrome executable.
-std::wstring GetChromeExecutablePath();
+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_