Remove some deprecated file_util wstring functions.

base/file_util.h

Index: base/file_util.h
===================================================================
--- base/file_util.h	(revision 29006)
+++ base/file_util.h	(working copy)
@@ -133,8 +133,6 @@
 // on different volumes, this will attempt to copy and delete. Returns
 // true for success.
 bool Move(const FilePath& from_path, const FilePath& to_path);
-// Deprecated temporary compatibility function.
-bool Move(const std::wstring& from_path, const std::wstring& to_path);
 
 // Renames file |from_path| to |to_path|. Both paths must be on the same
 // volume, or the function will fail. Destination file will be created
@@ -145,8 +143,6 @@
 
 // Copies a single file. Use CopyDirectory to copy directories.
 bool CopyFile(const FilePath& from_path, const FilePath& to_path);
-// Deprecated temporary compatibility function.
-bool CopyFile(const std::wstring& from_path, const std::wstring& to_path);
 
 // Copies the given path, and optionally all subdirectories and their contents
 // as well.
@@ -164,16 +160,12 @@
 // Returns true if the given path exists on the local filesystem,
 // false otherwise.
 bool PathExists(const FilePath& path);
-// Deprecated temporary compatibility function.
-bool PathExists(const std::wstring& path);
 
 // Returns true if the given path is writable by the user, false otherwise.
 bool PathIsWritable(const FilePath& path);
 
 // Returns true if the given path exists and is a directory, false otherwise.
 bool DirectoryExists(const FilePath& path);
-// Deprecated temporary compatibility function.
-bool DirectoryExists(const std::wstring& path);
 
 #if defined(OS_WIN)
 // Gets the creation time of the given file (expressed in the local timezone),