Revert r43217, r43215, r43208, r43207, and r43202.

runtime/bin/secure_socket_unsupported.cc

Index: runtime/bin/secure_socket_unsupported.cc
diff --git a/runtime/bin/secure_socket_unsupported.cc b/runtime/bin/secure_socket_unsupported.cc
index 231b71e06c29fb0421cf9d0e0d5cea965b958f49..ff7cce6399c90a04196d6e9727e6e888adbdd69a 100644
--- a/runtime/bin/secure_socket_unsupported.cc
+++ b/runtime/bin/secure_socket_unsupported.cc
@@ -98,15 +98,5 @@ void FUNCTION_NAME(SecureSocket_NewServicePort)(Dart_NativeArguments args) {
   Dart_ThrowException(DartUtils::NewDartArgumentError(
       "Secure Sockets unsupported on this platform"));
 }
-
-class SSLFilter {
- public:
-  static CObject* ProcessFilterRequest(const CObjectArray& request);
-};
-
-CObject* SSLFilter::ProcessFilterRequest(const CObjectArray& request) {
-  return CObject::IllegalArgumentError();
-}
-
 }  // namespace bin
 }  // namespace dart