Revert of Separate Scope into DeclarationScope and Scope

src/compiler/ast-graph-builder.h

Index: src/compiler/ast-graph-builder.h
diff --git a/src/compiler/ast-graph-builder.h b/src/compiler/ast-graph-builder.h
index bd307ba29ad129377d24db86987ab17a5a4c2cc8..1e5b5dce866a140606c8924aa2ea12fd199fa5b5 100644
--- a/src/compiler/ast-graph-builder.h
+++ b/src/compiler/ast-graph-builder.h
@@ -468,8 +468,7 @@
 //
 class AstGraphBuilder::Environment : public ZoneObject {
  public:
-  Environment(AstGraphBuilder* builder, DeclarationScope* scope,
-              Node* control_dependency);
+  Environment(AstGraphBuilder* builder, Scope* scope, Node* control_dependency);
 
   int parameters_count() const { return parameters_count_; }
   int locals_count() const { return locals_count_; }