Disable dependency_grapher_test on dart2js for now.

pkg/pkg.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.
 
 # Don't run any test-like files that show up in packages directories. It
 # shouldn't be necessary to run "pub install" in these packages, but if you do
 # it shouldn't break the tests.
 */packages/*/*: Skip
 */*/packages/*/*: Skip
 */*/*/packages/*/*: Skip
@@ skipping 49 matching lines @@
 collection/test/equality_test/04: Fail # Issue 1533
 collection/test/equality_test/05: Fail # Issue 1533
 collection/test/equality_test/none: Pass, Fail # Issue 14348
 compiler/tool/*: SkipByDesign # Only meant to run on vm
 front_end/tool/*: SkipByDesign # Only meant to run on vm
 lookup_map/test/version_check_test: SkipByDesign # Only meant to run in vm.
 typed_data/test/typed_buffers_test/01: Fail # Not supporting Int64List, Uint64List.
 front_end/test/memory_file_system_test: CompileTimeError # Issue 23773
 front_end/test/physical_file_system_test: SkipByDesign # Uses dart:io
 front_end/test/src/base/libraries_reader_test: SkipByDesign # Uses dart:io
+front_end/test/dependency_grapher_test: SkipByDesign # Uses dart:io
 
 [ $compiler == dart2js && $fast_startup ]
 front_end/test/*: SkipByDesign # Tests written with dart:mirrors.
 
 [ $compiler == dart2js && $builder_tag != dart2js_analyzer ]
 analyzer/test/*: Skip # Issue 26813
 analyzer/tool/*: Skip # Issue 26813
 analysis_server/test/*: Skip # Issue 26813
 
 [ $compiler == dart2js && $checked ]
@@ skipping 122 matching lines @@
 analyzer/test/src/task/strong/checker_test: Crash # Issue 24485
 analyzer/test/src/task/strong/inferred_type_test: Crash # Issue 24485
 analyzer/test/src/task/strong_mode_test: Crash # Issue 24485
 analyzer/test/src/task/yaml_test: Crash # Issue 24485
 
 [ $noopt || $runtime == dart_precompiled ]
 *: SkipByDesign # The pkg test framework imports dart:mirrors.
 
 [ $compiler == dart2js && $cps_ir && $checked ]
 *: Skip # `assert` not implemented, about 75% tests crash