Fixed access to `constraint_flags` array in ParseHEVCCodecId function.

media/base/video_codecs.cc

 // Copyright 2015 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 "media/base/video_codecs.h"
 
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
@@ skipping 260 matching lines @@
     DVLOG(4) << __func__ << ": unexpected number of trailing bytes in HEVC "
              << "codec id " << codec_id;
     return false;
   }
   for (size_t i = 4; i < elem.size(); ++i) {
     unsigned constr_byte = 0;
     if (!base::HexStringToUInt(elem[i], &constr_byte) || constr_byte > 0xFF) {
       DVLOG(4) << __func__ << ": invalid constraint byte=" << elem[i];
       return false;
     }
-    constraint_flags[i] = constr_byte;
+    constraint_flags[i - 4] = constr_byte;
   }
 
   return true;
 }
 #endif
 
 }  // namespace media