Fix several element properties in serialization.

pkg/compiler/lib/src/elements/common.dart

Index: pkg/compiler/lib/src/elements/common.dart
diff --git a/pkg/compiler/lib/src/elements/common.dart b/pkg/compiler/lib/src/elements/common.dart
index 6c9a013451a35f19ce281285945374e4f9bcd130..3786967a2f6dd475f7c0d1c0bf5571ef0cf347b0 100644
--- a/pkg/compiler/lib/src/elements/common.dart
+++ b/pkg/compiler/lib/src/elements/common.dart
@@ -594,3 +594,16 @@ abstract class MixinApplicationElementCommon
     });
   }
 }
+
+abstract class AbstractFieldElementCommon implements AbstractFieldElement {
+  @override
+  bool get isInstanceMember {
+    return isClassMember && !isStatic;
+  }
+
+  @override
+  bool get isAbstract {
+    return getter != null && getter.isAbstract ||
+        setter != null && setter.isAbstract;
+  }
+}