Implement Symbol correctly in dart2js.

dart/tests/language/language_dart2js.status

 # Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 [ $compiler == dart2js || $compiler == dart2dart ]
 class_literal_test/01: Fail # Class literals are expression now; delete this test.
 class_literal_test/02: Fail # Class literals are expression now; delete this test.
 class_literal_test/05: Fail # Class literals are expression now; delete this test.
 class_literal_test/06: Fail # Class literals are expression now; delete this test.
 class_literal_test/07: Fail # Class literals are expression now; delete this test.
@@ skipping 308 matching lines @@
 optimization_test: Fail, OK # Expects negative results of bit-operations.
 
 expect_test: Fail, OK # JavaScript canonicalizes all strings. This test assumes that string-concatenation returns a new string.
 
 # Partially implemented redirecting constructors makes this throw instead
 # of failing.
 const_factory_negative_test: Crash, Fail
 
 assign_top_method_test: Fail
 
-super_getter_setter_test: Fail # MirrorSystem.getName not yet implemented.
-
 
 [ $compiler == dart2js && $runtime == none ]
 *: Fail, Pass # TODO(ahe): Triage these tests.
 
 
 [ $compiler == dart2js && ($runtime == ff || $runtime == jsshell || $runtime == ie9)]
 arithmetic_test: Fail # Issue 7881
 
 
 [ $compiler == dart2js && $runtime == ie9 ]
@@ skipping 19 matching lines @@
 call_through_null_getter_test: Fail
 closure3_test: Fail
 execute_finally3_test: Fail
 method_invocation_test: Fail
 null_pointer_exception_test: Fail
 stack_overflow_test: Fail
 stack_overflow_stacktrace_test: Fail
 string_interpolate_npe_test: Fail
 closure_call_wrong_argument_count_negative_test: Skip
 label_test: Skip