bindings: Use CreateDataProperty() instead of ForceSet()

Source/bindings/core/v8/custom/V8InjectedScriptHostCustom.cpp

Index: Source/bindings/core/v8/custom/V8InjectedScriptHostCustom.cpp
diff --git a/Source/bindings/core/v8/custom/V8InjectedScriptHostCustom.cpp b/Source/bindings/core/v8/custom/V8InjectedScriptHostCustom.cpp
index 711660a221e95b51290102b292feee5fc94e3a2f..62381b7d02f8d592841c77cda963007b11d35c54 100644
--- a/Source/bindings/core/v8/custom/V8InjectedScriptHostCustom.cpp
+++ b/Source/bindings/core/v8/custom/V8InjectedScriptHostCustom.cpp
@@ -565,7 +565,9 @@ void V8InjectedScriptHost::setNonEnumPropertyMethodCustom(const v8::FunctionCall
         return;
 
     v8::Local<v8::Object> object = info[0].As<v8::Object>();
-    object->ForceSet(info.GetIsolate()->GetCurrentContext(), info[1], info[2], v8::DontEnum);
+    v8::Local<v8::String> key = info[1].As<v8::String>();
+    auto unused = object->DefineOwnProperty(info.GetIsolate()->GetCurrentContext(), key, info[2], v8::DontEnum);

[bashi, 2015/06/03 03:05:30]

This causes an exception.

+    ALLOW_UNUSED_LOCAL(unused);
 }
 
 void V8InjectedScriptHost::bindMethodCustom(const v8::FunctionCallbackInfo<v8::Value>& info)