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

base/string_util.cc

 // 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.
 
 #include "base/string_util.h"
 
 #include "build/build_config.h"
 
 #include <ctype.h>
 #include <errno.h>
@@ skipping 372 matching lines @@
 const char kWhitespaceASCII[] = {
   0x09,    // <control-0009> to <control-000D>
   0x0A,
   0x0B,
   0x0C,
   0x0D,
   0x20,    // Space
   0
 };
 
+const char kUtf8ByteOrderMark[] = "\xEF\xBB\xBF";
+
 template<typename STR>
 TrimPositions TrimStringT(const STR& input,
                           const typename STR::value_type trim_chars[],
                           TrimPositions positions,
                           STR* output) {
   // Find the edges of leading/trailing whitespace as desired.
   const typename STR::size_type last_char = input.length() - 1;
   const typename STR::size_type first_good_char = (positions & TRIM_LEADING) ?
       input.find_first_not_of(trim_chars) : 0;
   const typename STR::size_type last_good_char = (positions & TRIM_TRAILING) ?
@@ skipping 1407 matching lines @@
   // Each input byte creates two output hex characters.
   std::string ret(size * 2, '\0');
 
   for (size_t i = 0; i < size; ++i) {
     char b = reinterpret_cast<const char*>(bytes)[i];
     ret[(i * 2)] = kHexChars[(b >> 4) & 0xf];
     ret[(i * 2) + 1] = kHexChars[b & 0xf];
   }
   return ret;
 }