| Index: pkg/observe/lib/src/compound_binding.dart
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| diff --git a/pkg/observe/lib/src/compound_binding.dart b/pkg/observe/lib/src/compound_binding.dart
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| index a6195864524fd1fb39e8b00e6f543417332084cb..3d279268cf99fe3939f08a16b609ff53100c585e 100644
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| --- a/pkg/observe/lib/src/compound_binding.dart
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| +++ b/pkg/observe/lib/src/compound_binding.dart
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| @@ -27,7 +27,7 @@ typedef Object CompoundBindingCombinator(Map objects);
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|   *     binding.bind('nameN', objN, pathN);
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|   */
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|  // TODO(jmesserly): rename to something that indicates it's a computed value?
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| -class CompoundBinding extends ChangeNotifierBase {
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| +class CompoundBinding extends ChangeNotifier {
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|    CompoundBindingCombinator _combinator;
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|  
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|    // TODO(jmesserly): ideally these would be String keys, but sometimes we
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| 
 |