Revert "dart2js cps: Introduce GetStatic/SetStatic."

pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart

Index: pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart
diff --git a/pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart b/pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart
index f834d3364095b2140fc4bd6ea7640afaae67c706..552e24dc907e5f6431b15947e28d0b16e1045864 100644
--- a/pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart
+++ b/pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart
@@ -658,14 +658,6 @@ class ParentVisitor extends RecursiveVisitor {
     node.object.parent = node;
   }
 
-  processGetStatic(GetStatic node) {
-  }
-
-  processSetStatic(SetStatic node) {
-    node.value.parent = node;
-    node.body.parent = node;
-  }
-
   processGetMutableVariable(GetMutableVariable node) {
     node.variable.parent = node;
   }