Revert of Separate Scope into DeclarationScope and Scope

src/ast/ast-traversal-visitor.h

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_AST_AST_TRAVERSAL_VISITOR_H_
 #define V8_AST_AST_TRAVERSAL_VISITOR_H_
 
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
 
@@ skipping 268 matching lines @@
 template <class Subclass>
 void AstTraversalVisitor<Subclass>::VisitDebuggerStatement(
     DebuggerStatement* stmt) {
   PROCESS_NODE(stmt);
 }
 
 template <class Subclass>
 void AstTraversalVisitor<Subclass>::VisitFunctionLiteral(
     FunctionLiteral* expr) {
   PROCESS_EXPRESSION(expr);
-  DeclarationScope* scope = expr->scope();
+  Scope* scope = expr->scope();
   RECURSE_EXPRESSION(VisitDeclarations(scope->declarations()));
   RECURSE_EXPRESSION(VisitStatements(expr->body()));
 }
 
 template <class Subclass>
 void AstTraversalVisitor<Subclass>::VisitNativeFunctionLiteral(
     NativeFunctionLiteral* expr) {
   PROCESS_EXPRESSION(expr);
 }
 
@@ skipping 195 matching lines @@
 
 #undef PROCESS_NODE
 #undef PROCESS_EXPRESSION
 #undef RECURSE_EXPRESSION
 #undef RECURSE
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_AST_AST_TRAVERSAL_VISITOR_H_