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

chrome_frame/chrome_launcher.h

Index: chrome_frame/chrome_launcher.h
===================================================================
--- chrome_frame/chrome_launcher.h	(revision 29088)
+++ chrome_frame/chrome_launcher.h	(working copy)
@@ -7,6 +7,8 @@
 
 #include <string>
 
+#include "base/file_path.h"
+
 class CommandLine;
 
 namespace chrome_launcher {
@@ -30,12 +32,12 @@
 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)();