Do the codec string parsing for MSE in media, instead of Blink

Source/platform/ContentType.cpp

 /*
  * Copyright (C) 2006, 2008 Apple Inc.  All rights reserved.
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2009 Google Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
@@ skipping 58 matching lines @@
     String strippedType = m_type.stripWhiteSpace();
 
     // "type" can have parameters after a semi-colon, strip them
     size_t semi = strippedType.find(';');
     if (semi != kNotFound)
         strippedType = strippedType.left(semi).stripWhiteSpace();
 
     return strippedType;
 }
 
-Vector<String> ContentType::codecs() const
-{
-    String codecsParameter = parameter("codecs");
-
-    if (codecsParameter.isEmpty())
-        return Vector<String>();
-
-    Vector<String> codecs;
-    codecsParameter.split(',', codecs);
-    for (size_t i = 0; i < codecs.size(); ++i)
-        codecs[i] = codecs[i].simplifyWhiteSpace();
-
-    return codecs;
-}
-
 } // namespace blink