Update status for docgen/test/multi_library_test to skip on all browsers

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 293 matching lines @@
 template_binding: Skip
 mutation_observer: Skip
 polymer_expressions/test/syntax_test: Skip
 polymer_expressions/test/globals_test: Skip
 polymer_expressions/test/bindings_test: Skip
 third_party/html5lib/test/browser/browser_test: Skip
 
 [ $runtime == safari || $runtime == ie9 || $runtime == ie10 ]
 polymer_expressions/test/globals_test: Fail # Issue 16568
 
-[ $runtime == safari || $runtime == chrome || $runtime == ie9 || $runtime == ff || $runtime == dartium || $runtime == drt ]
+[ $browser ]
 docgen/test/generate_json_test: Skip  # Uses dart:io
 docgen/test/single_library_test: Skip # Uses dart:io
 docgen/test/multi_library_test: Skip # Uses dart:io
 scheduled_test/test/scheduled_server_test: Skip # Uses dart:io
 
 [ $browser || $runtime == vm ]
 unittest/test/missing_tick_test: Fail, OK # Expected to fail, due to timeout.
 
 
 [ $compiler == none && ($runtime == dartium || $runtime == drt) ]
@@ skipping 47 matching lines @@
 stack_trace/test/chain_test: PubGetError
 stack_trace/test/frame_test: PubGetError
 stack_trace/test/trace_test: PubGetError
 stack_trace/test/vm_test: PubGetError
 
 [ $runtime == ie9 ]
 polymer: Pass, Fail, Timeout # Issue 16717
 
 [ $compiler == dart2js && $mode == debug ]
 docgen/test/single_library_test: Slow, Pass