Move UTF16ToASCII, remove WideToASCII.

base/files/file_path.cc

 // Copyright (c) 2012 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.
 
 #include "base/files/file_path.h"
 
 #include <string.h>
 #include <algorithm>
 
 #include "base/basictypes.h"
@@ skipping 615 matching lines @@
 #endif
 }
 
 #elif defined(OS_WIN)
 string16 FilePath::LossyDisplayName() const {
   return path_;
 }
 
 std::string FilePath::MaybeAsASCII() const {
   if (IsStringASCII(path_))
-    return WideToASCII(path_);
-  return "";
+    return UTF16ToASCII(path_);
+  return std::string();
 }
 
 std::string FilePath::AsUTF8Unsafe() const {
   return WideToUTF8(value());
 }
 
 string16 FilePath::AsUTF16Unsafe() const {
   return value();
 }
 
@@ skipping 659 matching lines @@
 bool FilePath::IsContentUri() const {
   return StartsWithASCII(path_, "content://", false /*case_sensitive*/);
 }
 #endif
 
 }  // namespace base
 
 void PrintTo(const base::FilePath& path, std::ostream* out) {
   *out << path.value();
 }