Revert of [es6] Fix scoping for default parameters in arrow functions

src/ast-expression-visitor.cc

Index: src/ast-expression-visitor.cc
diff --git a/src/ast-expression-visitor.cc b/src/ast-expression-visitor.cc
index 32cf2c75277fc4b3292b08449f2383e3ca4e26b7..d534d1f0f036c1210175cd7f7b89505c7016b860 100644
--- a/src/ast-expression-visitor.cc
+++ b/src/ast-expression-visitor.cc
@@ -32,20 +32,14 @@
   } while (false)
 
 
-AstExpressionVisitor::AstExpressionVisitor(Isolate* isolate, Expression* root)
+AstExpressionVisitor::AstExpressionVisitor(Isolate* isolate,
+                                           FunctionLiteral* root)
     : root_(root), depth_(0) {
   InitializeAstVisitor(isolate);
 }
 
 
-AstExpressionVisitor::AstExpressionVisitor(uintptr_t stack_limit,
-                                           Expression* root)
-    : root_(root), depth_(0) {
-  InitializeAstVisitor(stack_limit);
-}
-
-
-void AstExpressionVisitor::Run() { RECURSE(Visit(root_)); }
+void AstExpressionVisitor::Run() { RECURSE(VisitFunctionLiteral(root_)); }
 
 
 void AstExpressionVisitor::VisitVariableDeclaration(VariableDeclaration* decl) {
@@ -229,9 +223,6 @@
   ZoneList<ObjectLiteralProperty*>* props = expr->properties();
   for (int i = 0; i < props->length(); ++i) {
     ObjectLiteralProperty* prop = props->at(i);
-    if (!prop->key()->IsLiteral()) {
-      RECURSE_EXPRESSION(Visit(prop->key()));
-    }
     RECURSE_EXPRESSION(Visit(prop->value()));
   }
 }
@@ -345,27 +336,10 @@
 }
 
 
-void AstExpressionVisitor::VisitClassLiteral(ClassLiteral* expr) {
-  VisitExpression(expr);
-  if (expr->extends() != nullptr) {
-    RECURSE_EXPRESSION(Visit(expr->extends()));
-  }
-  RECURSE_EXPRESSION(Visit(expr->constructor()));
-  ZoneList<ObjectLiteralProperty*>* props = expr->properties();
-  for (int i = 0; i < props->length(); ++i) {
-    ObjectLiteralProperty* prop = props->at(i);
-    if (!prop->key()->IsLiteral()) {
-      RECURSE_EXPRESSION(Visit(prop->key()));
-    }
-    RECURSE_EXPRESSION(Visit(prop->value()));
-  }
-}
-
-
-void AstExpressionVisitor::VisitSpread(Spread* expr) {
-  VisitExpression(expr);
-  RECURSE_EXPRESSION(Visit(expr->expression()));
-}
+void AstExpressionVisitor::VisitClassLiteral(ClassLiteral* expr) {}
+
+
+void AstExpressionVisitor::VisitSpread(Spread* expr) {}
 
 
 void AstExpressionVisitor::VisitEmptyParentheses(EmptyParentheses* expr) {}