Revert of Put Scopes into temporary Zone

src/ast/ast.cc

Index: src/ast/ast.cc
diff --git a/src/ast/ast.cc b/src/ast/ast.cc
index 12e6f206711dba957124c7639a25b4c1c9e89dcd..a2fc8997a4a07be151afd82ac4c6de0016c762e7 100644
--- a/src/ast/ast.cc
+++ b/src/ast/ast.cc
@@ -203,18 +203,6 @@
       end_position_(end_position),
       raw_name_(name),
       next_unresolved_(nullptr) {}
-
-VariableProxy::VariableProxy(Zone* zone, const VariableProxy* copy_from)
-    : Expression(zone, copy_from->position(), kVariableProxy),
-      bit_field_(copy_from->bit_field_),
-      end_position_(copy_from->end_position_),
-      next_unresolved_(nullptr) {
-  if (copy_from->is_resolved()) {
-    var_ = copy_from->var_;
-  } else {
-    raw_name_ = copy_from->raw_name_;
-  }
-}
 
 void VariableProxy::BindTo(Variable* var) {
   DCHECK((is_this() && var->is_this()) || raw_name() == var->raw_name());