Removed Polymer from Observatory deps

packages/polymer_interop/lib/src/polymer_proxy_mixin.dart

Index: packages/polymer_interop/lib/src/polymer_proxy_mixin.dart
diff --git a/packages/polymer_interop/lib/src/polymer_proxy_mixin.dart b/packages/polymer_interop/lib/src/polymer_proxy_mixin.dart
deleted file mode 100644
index cd9f0f87f3245fcd5d2d2a3e7907773423433e86..0000000000000000000000000000000000000000
--- a/packages/polymer_interop/lib/src/polymer_proxy_mixin.dart
+++ /dev/null
@@ -1,63 +0,0 @@
-// 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.
-library polymer_interop.src.js_element_proxy;
-
-import 'dart:html' show Element, DocumentFragment;
-import 'dart:js' as js;
-import 'package:web_components/web_components.dart'
-    show CustomElementProxyMixin;
-
-/// A mixin to make it easier to interoperate with Polymer JS elements. This
-/// exposes only a subset of the public api that is most useful from external
-/// elements.
-///
-/// Since mixins can't mixin or extend other mixins, you must also
-/// mixin the [CustomElementProxyMixin] class from `web_components`. The
-/// implements statement here enforces that.
-abstract class PolymerProxyMixin implements CustomElementProxyMixin {
-  /// The underlying Js Element's `$` property.
-  js.JsObject get $ => jsElement[r'$'];
-
-  /// By default the data bindings will be cleaned up when this custom element
-  /// is detached from the document. Overriding this to return `true` will
-  /// prevent that from happening.
-  bool get preventDispose => jsElement['preventDispose'];
-  set preventDispose(bool newValue) => jsElement['preventDispose'] = newValue;
-
-  /// Force any pending property changes to synchronously deliver to handlers
-  /// specified in the `observe` object. Note, normally changes are processed at
-  /// microtask time.
-  ///
-  // Dart note: renamed to `deliverPropertyChanges` to be more consistent with
-  // other polymer.dart elements.
-  void deliverPropertyChanges() {
-    jsElement.callMethod('deliverChanges', []);
-  }
-
-  /// Inject HTML which contains markup bound to this element into a target
-  /// element (replacing target element content).
-  DocumentFragment injectBoundHTML(String html, [Element element]) =>
-      jsElement.callMethod('injectBoundHTML', [html, element]);
-
-  /// Creates dom cloned from the given template, instantiating bindings with
-  /// this element as the template model and `PolymerExpressions` as the binding
-  /// delegate.
-  DocumentFragment instanceTemplate(Element template) =>
-      jsElement.callMethod('instanceTemplate', [template]);
-
-  /// This method should rarely be used and only if `cancelUnbindAll` has been
-  /// called to prevent element unbinding. In this case, the element's bindings
-  /// will not be automatically cleaned up and it cannot be garbage collected by
-  /// by the system. If memory pressure is a concern or a large amount of
-  /// elements need to be managed in this way, `unbindAll` can be called to
-  /// deactivate the element's bindings and allow its memory to be reclaimed.
-  void unbindAll() => jsElement.callMethod('unbindAll', []);
-
-  /// Call in `detached` to prevent the element from unbinding when it is
-  /// detached from the dom. The element is unbound as a cleanup step that
-  /// allows its memory to be reclaimed. If `cancelUnbindAll` is used, consider
-  ///calling `unbindAll` when the element is no longer needed. This will allow
-  ///its memory to be reclaimed.
-  void cancelUnbindAll() => jsElement.callMethod('cancelUnbindAll', []);
-}