Move ASCIIToWide and ASCIIToUTF16 to utf_string_conversions.h. I've found it...

base/utf_string_conversions.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.

[Peter Kasting, 2010/07/28 22:49:34]

Nit: 2010

 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_UTF_STRING_CONVERSIONS_H_
 #define BASE_UTF_STRING_CONVERSIONS_H_
 #pragma once
 
 #include <string>
 
 #include "base/string16.h"
@@ skipping 29 matching lines @@
 // porting whatever module uses wstring and the conversion is being used as a
 // stopcock.  This makes it easy to grep for the ones that should be removed.
 #if defined(OS_WIN)
 # define WideToUTF16Hack
 # define UTF16ToWideHack
 #else
 # define WideToUTF16Hack WideToUTF16
 # define UTF16ToWideHack UTF16ToWide
 #endif
 
+// These convert an ASCII string, typically a hardcoded constant, to a
+// UTF16/Wide string.
+//
+// Note that this doesn't use StringPiece because it's very common to need
+// ASCIIToUTF16("foo"), and either we have to include it in this file, or
+// forward declare it and force all callers to include string_piece.h. Given
+// that string_piece brings in complicated stuff like <algorithm>, it's
+// easier to just duplicate these very simple definitions for the two calling
+// cases we actually use.
+std::wstring ASCIIToWide(const char* ascii);
+std::wstring ASCIIToWide(const std::string& ascii);
+string16 ASCIIToUTF16(const char* ascii);
+string16 ASCIIToUTF16(const std::string& ascii);
+
 #endif  // BASE_UTF_STRING_CONVERSIONS_H_