Make V8ValueConverter.FromV8Value behave similarly to JSON.stringify

content/renderer/v8_value_converter_impl.h

Index: content/renderer/v8_value_converter_impl.h
diff --git a/content/renderer/v8_value_converter_impl.h b/content/renderer/v8_value_converter_impl.h
index baf061ab0c47b08b627cfb2e180ff85cb6991eeb..cde780a2147656e99ae61763818d2f02f2c16de0 100644
--- a/content/renderer/v8_value_converter_impl.h
+++ b/content/renderer/v8_value_converter_impl.h
@@ -23,8 +23,8 @@ class CONTENT_EXPORT V8ValueConverterImpl : public content::V8ValueConverter {
   V8ValueConverterImpl();
 
   // V8ValueConverter implementation.
-  virtual bool GetUndefinedAllowed() const OVERRIDE;
-  virtual void SetUndefinedAllowed(bool val) OVERRIDE;
+  virtual UndefinedValueBehavior GetUndefinedValueBehavior() const OVERRIDE;
+  virtual void SetUndefinedValueBehavior(UndefinedValueBehavior val) OVERRIDE;
   virtual bool GetDateAllowed() const OVERRIDE;
   virtual void SetDateAllowed(bool val) OVERRIDE;
   virtual bool GetRegexpAllowed() const OVERRIDE;
@@ -58,8 +58,8 @@ class CONTENT_EXPORT V8ValueConverterImpl : public content::V8ValueConverter {
   base::Value* FromV8Object(v8::Handle<v8::Object> object,
                             std::set<int>* unique_set) const;
 
-  // If true, we will convert undefined JavaScript values to null.
-  bool undefined_allowed_;
+  // Determines how undefined values should be converted.
+  UndefinedValueBehavior undefined_value_behavior_;
 
   // If true, we will convert Date JavaScript objects to doubles.
   bool date_allowed_;