Removed Polymer from Observatory deps

packages/polymer/e2e_test/canonicalization/test/dev_common.dart

-// Copyright (c) 2014, 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.
-
-/// Tests how canonicalization works when developing in Dartium.
-library canonicalization.test.dev_common;
-
-import 'package:unittest/unittest.dart';
-import 'package:unittest/html_config.dart';
-import 'package:polymer/polymer.dart';
-
-import 'package:canonicalization/a.dart' show a;
-import 'packages/canonicalization/b.dart' show b;
-import 'package:canonicalization/c.dart' show c;
-import 'package:canonicalization/d.dart' as d1 show d;
-import 'packages/canonicalization/d.dart' as d2 show d;
-
-main() {
-  initPolymer();
-  useHtmlConfiguration();
-
-  setUp(() => Polymer.onReady);
-
-  test('canonicalization', () {
-    expect(a, 1, reason: 'Dartium loads "a" via a "package:" url.');
-
-    // We shouldn't be using 'packages/', but we do just to check that Dartium
-    // can't infer a "package:" url for it.
-    expect(b, 1, reason: 'Dartium picks the relative url for "b".');
-    expect(c, 2, reason: '"c" was always imported with "package:" urls.');
-    expect(d1.d, 1, reason: '"a" loads via "package:", but "b" does not.');
-    expect(d2.d, 1, reason: '"b" loads via a relative url, but "a" does not.');
-  });
-}