[dartium] Dart half of ScriptValue refactoring.

Source/bindings/dart/DartUtilities.h

Index: Source/bindings/dart/DartUtilities.h
diff --git a/Source/bindings/dart/DartUtilities.h b/Source/bindings/dart/DartUtilities.h
index 24a7a23ef141a1f05bdcfbb2fb804a8c1ac60f41..b5f4ceb39853bc81df74dec733faac265f9e6d34 100644
--- a/Source/bindings/dart/DartUtilities.h
+++ b/Source/bindings/dart/DartUtilities.h
@@ -37,8 +37,8 @@
 #include "DartWebkitClassIds.h"
 
 #include "bindings/common/Dictionary.h"
-#include "bindings/common/ScriptValue.h"
 #include "bindings/dart/DartDOMData.h"
+#include "bindings/dart/DartScriptValue.h"
 #include "bindings/dart/DartStringCache.h"
 #include "bindings/v8/ScriptPromise.h"
 #include "bindings/v8/SerializedScriptValue.h"
@@ -518,8 +518,7 @@ public:
     // to observe from user code.
     static ScriptValue dartToScriptValueWithNullCheck(Dart_Handle handle, Dart_Handle& exception)
     {
-        v8::Isolate* isolate = v8::Isolate::GetCurrent();
-        return Dart_IsNull(handle) ? ScriptValue(v8::Undefined(isolate), isolate) : dartToScriptValue(handle, exception);
+        return dartToScriptValue(handle, exception);
     }
     static ScriptValue dartToScriptValueWithNullCheck(Dart_NativeArguments args, int index, Dart_Handle& exception)
     {