Land Alexander's change that throw on abstract class instantiations.

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 ]
 # VM specific tests that should not be run by dart2js.
 *vm_test: Skip
 *vm_negative_test: Skip
 
 [ $compiler == dart2js && $checked ]
@@ skipping 40 matching lines @@
 compile_time_constant_checked2_test/05: Fail, OK
 compile_time_constant_checked2_test/06: Fail, OK
 compile_time_constant_checked3_test/01: Fail, OK
 compile_time_constant_checked3_test/02: Fail, OK
 compile_time_constant_checked3_test/03: Fail, OK
 compile_time_constant_checked3_test/04: Fail, OK
 compile_time_constant_checked3_test/05: Fail, OK
 compile_time_constant_checked3_test/06: Fail, OK
 
 [ $compiler == dart2js ]
-abstract_runtime_error_test: Fail # http://dartbug.com/4737
 bad_constructor_test/04: Fail # http://dartbug.com/5519
 bad_constructor_test/05: Fail # http://dartbug.com/5519
 bad_constructor_test/06: Fail # http://dartbug.com/5519
 call_nonexistent_constructor_test: Fail
 constructor_named_arguments_test/01: Fail # http://dartbug.com/5519
 external_test/10: Fail # http://dartbug.com/5519
 getter_no_setter2_test/01: Fail # http://dartbug.com/5519
 getter_no_setter_test/01: Fail # http://dartbug.com/5519
 illegal_invocation_test/03: Fail # http://dartbug.com/5519
 isnot_malformed_type_test/01: Fail # http://dartbug.com/5519
@@ skipping 83 matching lines @@
 implicit_scope_test: Fail # duplicate definition of a="bar"
 library_prefixes_test: Fail # other is not a type
 local_function_test: Fail # TypeError: Object #<Closure> has no method '$call$2' (bad exception mapping).
 many_generic_instanceof_test: Fail # cannot resolve type T
 method_binding_test: Fail # internal error: super property read not implemented.
 method_override_test: Fail # cannot resolve type GetKeysFunctionType
 method_override2_test/00: Fail # accepts illegal override
 method_override2_test/01: Fail # accepts illegal override
 method_override2_test/02: Fail # accepts illegal override
 method_override2_test/03: Fail # accepts illegal override
-implicit_this_test/02: Fail # instantiation of abstract class
-implicit_this_test/03: Fail # instantiation of abstract class
 abstract_getter_test/01: Fail # instantiation of abstract class
 abstract_factory_constructor_test/01: Fail # instantiation of abstract class
 parameter_initializer6_negative_test: Fail # Issue 3502
 named_parameters2_test: Fail # Unimplemented non-matching static call
 named_parameters3_test: Fail # Unimplemented non-matching static call
 named_parameters4_test: Fail # Unimplemented non-matching static call
 named_parameters_aggregated_test/01: Fail # Presence of default values for optional params is not properly validated in type definitions.
 named_parameters_aggregated_test/03: Fail # Presence of default values for optional params is not properly validated in closure types.
 named_parameters_aggregated_test/05: Fail # Absence of positional parameters before named parameters does not trigger static type warning.
 pseudo_kw_test: Fail # Unexpected token '('
@@ skipping 177 matching lines @@
 [ $compiler == dart2js && $runtime == ff && $system == windows ]
 prefix_new_test: Fail # TODO(ahe): Enable wrapper-less tests on Firefox/Windows.
 first_class_types_test: Fail # http://dartbug.com/5523
 part2_test: Fail # TODO(ahe): Enable wrapper-less tests on Firefox/Windows.
 part_test: Fail # TODO(ahe): Enable wrapper-less tests on Firefox/Windows.
 export_test: Fail # Issue 5785
 export_cyclic_test: Fail # Issue 5785
 generic_creation_test: Fail # Issue 5785l
 import_combinators_test: Fail # Issue 3454
 first_class_types_libraries_test: Fail