wstring: remove wstring version of SplitString

base/string_split.cc

-// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// 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.
 
 #include "base/string_split.h"
 
 #include "base/logging.h"
 #include "base/string_util.h"
 #include "base/third_party/icu/icu_utf.h"
 #include "base/utf_string_conversions.h"
 
@@ skipping 16 matching lines @@
         TrimWhitespace(tmp, TRIM_ALL, &t_tmp);
         r->push_back(t_tmp);
       } else {
         r->push_back(tmp);
       }
       last = i + 1;
     }
   }
 }
 
-void SplitString(const std::wstring& str,
-                 wchar_t c,
-                 std::vector<std::wstring>* r) {
-  SplitStringT(str, c, true, r);
-}
-
-#if !defined(WCHAR_T_IS_UTF16)
 void SplitString(const string16& str,
                  char16 c,
                  std::vector<string16>* r) {
   DCHECK(CBU16_IS_SINGLE(c));
   SplitStringT(str, c, true, r);
 }
-#endif
 
 void SplitString(const std::string& str,
                  char c,
                  std::vector<std::string>* r) {
   DCHECK(c >= 0 && c < 0x7F);
   SplitStringT(str, c, true, r);
 }
 
 bool SplitStringIntoKeyValues(
     const std::string& line,
@@ skipping 157 matching lines @@
   SplitStringAlongWhitespaceT(str, result);
 }
 #endif
 
 void SplitStringAlongWhitespace(const std::string& str,
                                 std::vector<std::string>* result) {
   SplitStringAlongWhitespaceT(str, result);
 }
 
 }  // namespace base