IDL: Add support for [TreatNullAs=EmptyString]

Source/bindings/core/v8/custom/V8HistoryCustom.cpp

Index: Source/bindings/core/v8/custom/V8HistoryCustom.cpp
diff --git a/Source/bindings/core/v8/custom/V8HistoryCustom.cpp b/Source/bindings/core/v8/custom/V8HistoryCustom.cpp
index 693eb3bef01dc0f82fdedb46b22329eb95de0c62..427598bc3e51b4dad02154e142892777e081718f 100644
--- a/Source/bindings/core/v8/custom/V8HistoryCustom.cpp
+++ b/Source/bindings/core/v8/custom/V8HistoryCustom.cpp
@@ -66,8 +66,8 @@ void V8History::pushStateMethodCustom(const v8::FunctionCallbackInfo<v8::Value>&
     if (exceptionState.throwIfNeeded())
         return;
 
-    TOSTRING_VOID(V8StringResource<WithUndefinedOrNullCheck>, title, info[1]);
-    TOSTRING_VOID(V8StringResource<WithUndefinedOrNullCheck>, url, info[2]);
+    TOSTRING_VOID(V8StringResource<TreatNullAndUndefinedAsNullString>, title, info[1]);
+    TOSTRING_VOID(V8StringResource<TreatNullAndUndefinedAsNullString>, url, info[2]);
 
     History* history = V8History::toNative(info.Holder());
     history->stateObjectAdded(historyState.release(), title, url, FrameLoadTypeStandard, exceptionState);
@@ -82,8 +82,8 @@ void V8History::replaceStateMethodCustom(const v8::FunctionCallbackInfo<v8::Valu
     if (exceptionState.throwIfNeeded())
         return;
 
-    TOSTRING_VOID(V8StringResource<WithUndefinedOrNullCheck>, title, info[1]);
-    TOSTRING_VOID(V8StringResource<WithUndefinedOrNullCheck>, url, info[2]);
+    TOSTRING_VOID(V8StringResource<TreatNullAndUndefinedAsNullString>, title, info[1]);
+    TOSTRING_VOID(V8StringResource<TreatNullAndUndefinedAsNullString>, url, info[2]);
 
     History* history = V8History::toNative(info.Holder());
     history->stateObjectAdded(historyState.release(), title, url, FrameLoadTypeRedirectWithLockedBackForwardList, exceptionState);