polymer warning clean

pkg/polymer/lib/src/instance.dart

 // Copyright (c) 2013, 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.
 
 part of polymer;
 
 /**
  * Use this annotation to publish a field as an attribute. For example:
  *
  *     class MyPlaybackElement extends PolymerElement {
@@ skipping 563 matching lines @@
         _observeLog.fine('[$localName] observeArrayValue: register observer '
             '$name');
       }
       var sub = (value as ObservableList).changes.listen((changes) {
         invokeMethod(callbackName, [old]);
       });
       registerObserver('${MirrorSystem.getName(name)}__array', sub);
     }
   }
 
-  void unbindProperty(String name) => unregisterObserver(name);
+  bool unbindProperty(String name) => unregisterObserver(name);
 
   void unbindAllProperties() {
     if (_propertyObserver != null) {
       _propertyObserver.cancel();
       _propertyObserver = null;
     }
     unregisterObservers();
   }
 
   /** Bookkeeping observers for memory management. */
@@ skipping 303 matching lines @@
     var scope = findStyleController();
     if (scope != null && scopeHasElementStyle(scope, _STYLE_CONTROLLER_SCOPE)) {
       // allow inherited controller styles
       var decl = _declaration;
       var cssText = new StringBuffer();
       while (decl != null) {
         cssText.write(decl.cssTextForScope(_STYLE_CONTROLLER_SCOPE));
         decl = decl.superDeclaration;
       }
       if (cssText.length > 0) {
-        var style = this.element.cssTextToScopeStyle(cssText.toString(),
+        var style = decl.cssTextToScopeStyle(cssText.toString(),
               _STYLE_CONTROLLER_SCOPE);
         // TODO(sorvell): for now these styles are not shimmed
         // but we may need to shim them
         Polymer.applyStyleToScope(style, scope);
       }
     }
   }
 
   Node findStyleController() {
     if (js.context != null && js.context['ShadowDOMPolyfill'] != null) {
@@ skipping 154 matching lines @@
 
 class _PropertyValue {
   Object oldValue, newValue;
   _PropertyValue(this.oldValue);
 }
 
 class _PolymerExpressionsWithEventDelegate extends PolymerExpressions {
   prepareBinding(String path, name, node) =>
       Polymer.prepareBinding(path, name, node, super.prepareBinding);
 }