wstring: remove wstring version of SplitString

base/string_split.h

 // Copyright (c) 2011 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 BASE_STRING_SPLIT_H_
 #define BASE_STRING_SPLIT_H_
 #pragma once
 
 #include <string>
 #include <utility>
 #include <vector>
 
 #include "base/base_api.h"
 #include "base/string16.h"
 
 namespace base {
 
 // Splits |str| into a vector of strings delimited by |s|. Append the results
 // into |r| as they appear. If several instances of |s| are contiguous, or if
 // |str| begins with or ends with |s|, then an empty string is inserted.
 //
 // Every substring is trimmed of any leading or trailing white space.
-// Where wchar_t is char16 (i.e. Windows), |c| must be in BMP
-// (Basic Multilingual Plane). Elsewhere (Linux/Mac), wchar_t
-// should be a valid Unicode code point (32-bit).
-BASE_API void SplitString(const std::wstring& str,
-                          wchar_t c,
-                          std::vector<std::wstring>* r);
 // NOTE: |c| must be in BMP (Basic Multilingual Plane)
 BASE_API void SplitString(const string16& str,
                           char16 c,
                           std::vector<string16>* r);
 // |str| should not be in a multi-byte encoding like Shift-JIS or GBK in which
 // the trailing byte of a multi-byte character can be in the ASCII range.
 // UTF-8, and other single/multi-byte ASCII-compatible encodings are OK.
 // Note: |c| must be in the ASCII range.
 BASE_API void SplitString(const std::string& str,
                           char c,
@@ skipping 42 matching lines @@
 BASE_API void SplitStringAlongWhitespace(const std::wstring& str,
                                          std::vector<std::wstring>* result);
 BASE_API void SplitStringAlongWhitespace(const string16& str,
                                          std::vector<string16>* result);
 BASE_API void SplitStringAlongWhitespace(const std::string& str,
                                          std::vector<std::string>* result);
 
 }  // namespace base
 
 #endif  // BASE_STRING_SPLIT_H