Remove some deprecated file_util wstring functions.

base/file_util.cc

Index: base/file_util.cc
===================================================================
--- base/file_util.cc	(revision 29006)
+++ base/file_util.cc	(working copy)
@@ -322,10 +322,6 @@
   return ContentsEqual(FilePath::FromWStringHack(filename1),
                        FilePath::FromWStringHack(filename2));
 }
-bool CopyFile(const std::wstring& from_path, const std::wstring& to_path) {
-  return CopyFile(FilePath::FromWStringHack(from_path),
-                  FilePath::FromWStringHack(to_path));
-}
 bool CreateDirectory(const std::wstring& full_path) {
   return CreateDirectory(FilePath::FromWStringHack(full_path));
 }
@@ -345,9 +341,6 @@
 bool Delete(const std::wstring& path, bool recursive) {
   return Delete(FilePath::FromWStringHack(path), recursive);
 }
-bool DirectoryExists(const std::wstring& path) {
-  return DirectoryExists(FilePath::FromWStringHack(path));
-}
 bool EndsWithSeparator(std::wstring* path) {
   return EndsWithSeparator(FilePath::FromWStringHack(*path));
 }
@@ -389,16 +382,9 @@
   *path_str = path.ToWStringHack();
   return true;
 }
-bool Move(const std::wstring& from_path, const std::wstring& to_path) {
-  return Move(FilePath::FromWStringHack(from_path),
-              FilePath::FromWStringHack(to_path));
-}
 FILE* OpenFile(const std::wstring& filename, const char* mode) {
   return OpenFile(FilePath::FromWStringHack(filename), mode);
 }
-bool PathExists(const std::wstring& path) {
-  return PathExists(FilePath::FromWStringHack(path));
-}
 int ReadFile(const std::wstring& filename, char* data, int size) {
   return ReadFile(FilePath::FromWStringHack(filename), data, size);
 }