remove polymer expressions from the repo

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 141 matching lines @@
 source_maps/test/vlq_test: RuntimeError # A VLQ test checks for large numbers that
                                 # overflow in JS (numbers slightly larger than
                                 # 32 bits where we do bitwise operations).
 
 [ $runtime == opera && $compiler == dart2js ]
 intl/test/find_default_locale_browser_test: Fail
 intl/test/date_time_format_http_request_test: Skip # Timeout.
 
 [ $ie ]
 intl/test/date_time_format_http_request_test: Fail # Issue 8983
-polymer_expressions/test/syntax_test: Fail, Timeout, Pass # Issue 19138
 observe/test/list_path_observer_test: RuntimeError, Pass # Issue 20849
 
 [ $runtime == ie10 ]
 analyzer/test/generated/java_core_test: Pass, Timeout # Issue 19747
-polymer_expressions/*: Pass, RuntimeError # Issue 19265
 template_binding/test/template_binding_test: Pass, RuntimeError # Issue 19265
 typed_data/test/typed_buffers_test/none: Fail # Issue   17607 (I put this here explicitly, since this is not the same as on ie9)
 
 [ $runtime == ie10 || $runtime == ie11 ]
 scheduled_test/test/scheduled_test/current_schedule_errors_test: Skip # Issue 21007
 scheduled_test/test/scheduled_test/nested_task_test: Timeout # Skip 21007
 scheduled_test/test/scheduled_test/out_of_band_task_test: Skip # Issue 21007
 scheduled_test/test/scheduled_test/signal_error_test: Skip # Issue 21007
 scheduled_test/test/scheduled_test/task_return_value_test: Skip # Issue 21007
 scheduled_test/test/scheduled_test/timeout_test: Skip # Issue 21007
@@ skipping 138 matching lines @@
 unittest/test/single_failing_test: RuntimeError # 13921
 unittest/test/skipped_soloed_nested_test: RuntimeError # 13921
 unittest/test/teardown_test: RuntimeError # 13921
 unittest/test/testcases_immutable_test: RuntimeError # 13921
 
 
 [ $runtime == vm ]
 # Skip tests on the VM if the package depends on dart:html
 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
 http/test/html/*: Skip
 
 [ $browser ]
 docgen/test/*: Skip  # Uses dart:io
 scheduled_test/test/scheduled_process_test: Skip # Uses dart:io
 scheduled_test/test/scheduled_server_test: Skip # Uses dart:io
 scheduled_test/test/descriptor/*: Skip # Uses dart:io
 
 [ $compiler == none && $browser ]
@@ skipping 20 matching lines @@
 third_party/angular_tests/browser_test/core/scope: Skip # Requires checked mode.
 third_party/angular_tests/browser_test/core/zone: Skip # Requires checked mode.
 third_party/angular_tests/browser_test/directive/ng_repeat: Skip # Issue 17152
 third_party/angular_tests/browser_test/change_detection/dirty_checking_change_detector: Skip # Issue 17152
 
 [ $use_repository_packages ]
 analyzer/test/*: PubGetError
 
 [ $runtime == drt ]
 http/test/html/client_test: Skip # Issue 18566