Revert "Implement substitution for type variables."

tests/language/language_dart2js.status

Index: tests/language/language_dart2js.status
diff --git a/tests/language/language_dart2js.status b/tests/language/language_dart2js.status
index 6fc9f63e1711cc647138c89cf7cb2aecc7b95832..b50604acf2d05dd9ab7dbba8300baaec4f790f7f 100644
--- a/tests/language/language_dart2js.status
+++ b/tests/language/language_dart2js.status
@@ -166,6 +166,7 @@ function_type_alias_test: Fail # cannot resolve type Fun
 function_type_parameter2_test: Fail # Internal Error: expected optional parameters
 function_type_parameter_test: Fail # Internal Error: expected optional parameters
 generic_instanceof_test: Fail # cannot resolve type T
+generic_instanceof3_test: Fail # cannot handle generics.
 generic_test: Fail # cannot resolve type T
 get_set_syntax_test/00: Fail # Fixed by https://chromiumcodereview.appspot.com/10915111
 get_set_syntax_test/01: Fail # Fixed by https://chromiumcodereview.appspot.com/10915111
@@ -225,6 +226,8 @@ external_test/31: Fail
 
 
 # Implementation errors (library or generated code).
+generic_inheritance_test: Fail # Expect.isTrue(false) fails.
+generic_parameterized_extends_test: Fail # Expect.isTrue(false) fails.
 instanceof2_test: Fail # Expect.equals(expected: <true>, actual: <false>) fails.
 instanceof3_test: Fail # cannot resolve type UndeclaredType.
 instanceof4_test: Fail # Expect.isTrue(false) fails.