[debugger] make step positions for for-of compatible with interpreter.

src/full-codegen/full-codegen.h

 // Copyright 2012 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_FULL_CODEGEN_FULL_CODEGEN_H_
 #define V8_FULL_CODEGEN_FULL_CODEGEN_H_
 
 #include "src/allocation.h"
 #include "src/assert-scope.h"
 #include "src/ast/ast.h"
@@ skipping 644 matching lines @@
   void SetReturnPosition(FunctionLiteral* fun);
 
   enum InsertBreak { INSERT_BREAK, SKIP_BREAK };
 
   // During stepping we want to be able to break at each statement, but not at
   // every (sub-)expression. That is why by default we insert breaks at every
   // statement position, but not at every expression position, unless stated
   // otherwise.
   void SetStatementPosition(Statement* stmt,
                             InsertBreak insert_break = INSERT_BREAK);
-  void SetExpressionPosition(Expression* expr,
-                             InsertBreak insert_break = SKIP_BREAK);
+  void SetExpressionPosition(Expression* expr);
 
   // Consider an expression a statement. As such, we also insert a break.
   // This is used in loop headers where we want to break for each iteration.
   void SetExpressionAsStatementPosition(Expression* expr);
 
   void SetCallPosition(Expression* expr,
                        TailCallMode tail_call_mode = TailCallMode::kDisallow);
 
   void SetConstructCallPosition(Expression* expr) {
     // Currently call and construct calls are treated the same wrt debugging.
@@ skipping 373 matching lines @@
   Address start_;
   Address instruction_start_;
   uint32_t length_;
 };
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_FULL_CODEGEN_FULL_CODEGEN_H_