Merge the Sky Engine changes from the SkyDart branch

sky/engine/core/html/HTMLIFrameElement.h

Index: sky/engine/core/html/HTMLIFrameElement.h
diff --git a/sky/engine/core/html/HTMLIFrameElement.h b/sky/engine/core/html/HTMLIFrameElement.h
index 4415b465f83807ce2b472f595ca0a44476a6f02c..640840c795bec0d3132ab2f127ff3db129c4de0e 100644
--- a/sky/engine/core/html/HTMLIFrameElement.h
+++ b/sky/engine/core/html/HTMLIFrameElement.h
@@ -26,9 +26,9 @@ public:
 
     mojo::View* contentView() const { return m_contentView; }
 
-    ScriptValue takeServicesHandle(ScriptState*);
-    ScriptValue takeExposedServicesHandle(ScriptState*);
-    void embedViewManagerClient(const ScriptValue& client);
+    PassRefPtr<DartValue> takeServicesHandle(DartState*);
+    PassRefPtr<DartValue> takeExposedServicesHandle(DartState*);
+    void embedViewManagerClient(DartValue* client);
 
 private:
     explicit HTMLIFrameElement(Document&);