Ignore UTF-8's BOM when parsing userscript's metadata.

base/string_util.h

 // Copyright (c) 2006-2008 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.
 //
 // This file defines utility functions for working with strings.
 
 #ifndef BASE_STRING_UTIL_H_
 #define BASE_STRING_UTIL_H_
 
 #include <stdarg.h>   // va_list
@@ skipping 115 matching lines @@
 // any and all uses of "std::string()" as nicer-looking sugar.
 // These functions are threadsafe.
 const std::string& EmptyString();
 const std::wstring& EmptyWString();
 const string16& EmptyString16();
 
 extern const wchar_t kWhitespaceWide[];
 extern const char16 kWhitespaceUTF16[];
 extern const char kWhitespaceASCII[];
 
+extern const char kUtf8ByteOrderMark[];
+
 // Removes characters in trim_chars from the beginning and end of input.
 // NOTE: Safe to use the same variable for both input and output.
 bool TrimString(const std::wstring& input,
                 const wchar_t trim_chars[],
                 std::wstring* output);
 bool TrimString(const string16& input,
                 const char16 trim_chars[],
                 string16* output);
 bool TrimString(const std::string& input,
                 const char trim_chars[],
@@ skipping 480 matching lines @@
 #elif defined(WCHAR_T_IS_UTF32)
   typedef uint32 Unsigned;
 #endif
 };
 template<>
 struct ToUnsigned<short> {
   typedef unsigned short Unsigned;
 };
 
 #endif  // BASE_STRING_UTIL_H_