Revert "[kernel] offsets on direct property get/set"

pkg/kernel/lib/transformations/mixin_full_resolution.dart

Index: pkg/kernel/lib/transformations/mixin_full_resolution.dart
diff --git a/pkg/kernel/lib/transformations/mixin_full_resolution.dart b/pkg/kernel/lib/transformations/mixin_full_resolution.dart
index 8d8b345213b1aeef1a8c5599c91fb4ed7f364ce0..7f92ce9cf296fada7085e3013f95df9ab1ba3ec0 100644
--- a/pkg/kernel/lib/transformations/mixin_full_resolution.dart
+++ b/pkg/kernel/lib/transformations/mixin_full_resolution.dart
@@ -187,8 +187,7 @@ class SuperCallResolutionTransformer extends Transformer {
   visitSuperPropertyGet(SuperPropertyGet node) {
     Member target = hierarchy.getDispatchTarget(lookupClass, node.name);
     if (target != null) {
-      return new DirectPropertyGet(new ThisExpression(), target)
-        ..fileOffset = node.fileOffset;
+      return new DirectPropertyGet(new ThisExpression(), target);
     } else {
       return _callNoSuchMethod(node.name.name, new Arguments.empty(), node,
           isGetter: true, isSuper: true);
@@ -200,8 +199,7 @@ class SuperCallResolutionTransformer extends Transformer {
         hierarchy.getDispatchTarget(lookupClass, node.name, setter: true);
     if (target != null) {
       return new DirectPropertySet(
-          new ThisExpression(), target, visit(node.value))
-        ..fileOffset = node.fileOffset;
+          new ThisExpression(), target, visit(node.value));
     } else {
       // Call has to return right-hand-side.
       VariableDeclaration rightHandSide =