[turbofan] Remove for-in support from the AstGraphBuilder.

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 2463f42f8ba37bbd9b7db2d4f60867d7f410ce14..b5be12681206d6b99cff745548b0e23dd06f2db5 100644
--- a/src/compiler/ast-graph-builder.h
+++ b/src/compiler/ast-graph-builder.h
@@ -391,11 +391,6 @@ class AstGraphBuilder : public AstVisitor<AstGraphBuilder> {
   void VisitLiteralCompareTypeof(CompareOperation* expr, Expression* sub_expr,
                                  Handle<String> check);
 
-  // Dispatched from VisitForInStatement.
-  void VisitForInAssignment(Expression* expr, Node* value,
-                            const VectorSlotPair& feedback,
-                            BailoutId bailout_id);
-
   // Dispatched from VisitObjectLiteral.
   void VisitObjectLiteralAccessor(Node* home_object,
                                   ObjectLiteralProperty* property);