Revert "Web Socket compression - take two"

sdk/lib/io/http.dart

Index: sdk/lib/io/http.dart
diff --git a/sdk/lib/io/http.dart b/sdk/lib/io/http.dart
index 58791618c508f7a9ad676e0e3134c61b356d6af7..dd715599bed08cf8568bc05d5b5f5a031fa8cc85 100644
--- a/sdk/lib/io/http.dart
+++ b/sdk/lib/io/http.dart
@@ -686,11 +686,9 @@ abstract class HeaderValue {
    */
   static HeaderValue parse(String value,
                            {String parameterSeparator: ";",
-                            String valueSeparator: null,
                             bool preserveBackslash: false}) {
     return _HeaderValue.parse(value,
                               parameterSeparator: parameterSeparator,
-                              valueSeparator: valueSeparator,
                               preserveBackslash: preserveBackslash);
   }