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

Source/platform/ContentType.cpp

Index: Source/platform/ContentType.cpp
diff --git a/Source/platform/ContentType.cpp b/Source/platform/ContentType.cpp
index dee67f7d1b330e54907feef43f57601f85e83fa8..e21536d3a345c9ffd6fa58be6e3bedf81d2b5978 100644
--- a/Source/platform/ContentType.cpp
+++ b/Source/platform/ContentType.cpp
@@ -76,19 +76,4 @@ String ContentType::type() const
     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