Cleanup dart to string conversions.

Source/WebCore/bindings/dart/custom/DartDOMStringListCustom.cpp

Index: Source/WebCore/bindings/dart/custom/DartDOMStringListCustom.cpp
diff --git a/Source/WebCore/bindings/dart/custom/DartDOMStringListCustom.cpp b/Source/WebCore/bindings/dart/custom/DartDOMStringListCustom.cpp
index 2ece02957c9a88a74f83f4da1ec0f6e66c56e09a..0c7fbd2d8a9ccc1f286c21268eead7173648fa56 100644
--- a/Source/WebCore/bindings/dart/custom/DartDOMStringListCustom.cpp
+++ b/Source/WebCore/bindings/dart/custom/DartDOMStringListCustom.cpp
@@ -21,11 +21,10 @@ PassRefPtr<DOMStringList> DartDOMStringList::toNative(Dart_Handle handle, Dart_H
 
     RefPtr<DOMStringList> m_domStringList = DOMStringList::create();
     for (size_t i = 0; i < elements.size(); i++) {
-        RefPtr<StringImpl> element = DartUtilities::toStringImpl(elements[i], DartUtilities::ConvertNone, exception);
+        DartStringAdapter element = DartUtilities::dartToString(elements[i], exception);
         if (exception)
             return 0;
-        ASSERT(element.get());
-        m_domStringList->append(element.get());
+        m_domStringList->append(element);
     }
     return m_domStringList.release();
 }