Change assert implementation to not depend on a top-level function called 'assert'.

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 41 matching lines @@
 compile_time_constant8_test: Fail # We don't take the generic type into account yet.
 canonical_const_test: Fail # We don't take the generic type into account yet.
 
 # Fail "const EmptyLink<Element>" must be a compile-time constant if unchecked on linux.
 # Crash infinite loop on Mac and dart2js checked mode on linux.
 function_type_alias6_test: Crash, Fail
 
 static_initializer_type_error_test: Fail # Checked mode not supported.
 
 # Compilation errors.
+assert_lexical_scope_test: Fail # A setter named "assert" will inhibit asserts.
 const_var_test: Fail # Map literals take 2 type arguments.
 map_literal3_test: Fail # Map literals take 2 type arguments.
 ct_const_test: Fail # We don't take the generic type into account yet.
 char_escape_test: Fail # Unhandled non-BMP character: U+10000
 constructor6_test: Fail # Closures inside initializers not implemented.
 default_factory_library_test: Fail # lib is not a type
 dynamic_test: Fail # cannot resolve type F1
 factory3_test: Fail # internal error: visitIs for type variables not implemented
 function_literals2_test: Fail # Closures inside initializers not implemented.
 function_syntax_test/none: Fail # Closures inside initializers not implemented.
@@ skipping 131 matching lines @@
 map_literal2_negative_test: Fail # Negative language test.
 non_const_super_negative_test: Fail # Negative language test.
 number_identifier_negative_test: Fail # Negative language test.
 operator1_negative_test: Fail # Negative language test.
 override_field_test/04: Fail # Broken test.
 prefix16_test: Fail
 prefix18_negative_test: Fail # Negative language test.
 prefix20_negative_test: Fail # Negative language test.
 prefix23_negative_test: Fail # Negative language test.
 pseudo_kw_illegal_test/01: Fail # Negative language test.
+pseudo_kw_illegal_test/02: Fail # Negative language test.
 pseudo_kw_illegal_test/03: Fail # Negative language test.
 pseudo_kw_illegal_test/05: Fail # Negative language test.
 pseudo_kw_illegal_test/06: Fail # Negative language test.
 pseudo_kw_illegal_test/07: Fail # Negative language test.
 pseudo_kw_illegal_test/08: Fail # Negative language test.
 pseudo_kw_illegal_test/09: Fail # Negative language test.
 pseudo_kw_illegal_test/10: Fail # Negative language test.
 pseudo_kw_illegal_test/11: Fail # Negative language test.
 pseudo_kw_illegal_test/12: Fail # Negative language test.
 pseudo_kw_illegal_test/13: Fail # Negative language test.
@@ skipping 70 matching lines @@
 
 [ $compiler == dart2js && $runtime == safari ]
 arithmetic_test: Skip # BUG(3492): Times out.
 call_through_getter_test: Fail # Expected: ObjectNotClosureException got: Instance of 'TypeError'
 call_through_null_getter_test: Fail # Expected: ObjectNotClosureException got: Instance of 'TypeError'
 closure3_test: Fail # Uncaught error: Instance of 'TypeError'
 method_invocation_test: Fail # Uncaught error: Instance of 'TypeError'
 null_pointer_exception_test: Fail # Uncaught error: Instance of 'TypeError'
 string_interpolate_npe_test: Fail # Uncaught error: Instance of 'TypeError'