Remove unused import in polymer, fix comment.

pkg/polymer/lib/src/instance.dart

Index: pkg/polymer/lib/src/instance.dart
diff --git a/pkg/polymer/lib/src/instance.dart b/pkg/polymer/lib/src/instance.dart
index 5abafe03bafc16fc9d31ec8fabe770a4b59eab8f..0a1435eef7a2f5062361c5d7e463d84c80836a96 100644
--- a/pkg/polymer/lib/src/instance.dart
+++ b/pkg/polymer/lib/src/instance.dart
@@ -626,15 +626,7 @@ abstract class Polymer implements Element, Observable, NodeBindExtension {
     _observers = null;
   }
 
-  /// Bind a [property] in this object to a [path] in model. *Note* in Dart it

[Siggi Cherem (dart-lang), 2014/05/07 17:24:39]

this [path] was marking the import as 'used', so the analyzer didn't report the
warning.

-  /// is necessary to also define the field:
-  ///
-  ///     var myProperty;
-  ///
-  ///     ready() {
-  ///       super.ready();
-  ///       bindProperty(#myProperty, this, 'myModel.path.to.otherProp');

[Jennifer Messerly, 2014/05/07 19:28:53]

I fixed this code snippet in my port without removing it.

All it needs is:

bindProperty(#myProperty,
    new PathObserver(this, 'myModel.path.to.otherProp'));

[Siggi Cherem (dart-lang), 2014/05/07 19:34:48]

Done

-  ///     }
+  /// Bind the [name] property in this element to [bindable].
   Bindable bindProperty(Symbol name, Bindable bindable) {
     // Dart note: normally we only reach this code when we know it's a
     // property, but if someone uses bindProperty directly they might get a