Merge the Sky Engine changes from the SkyDart branch

sky/engine/core/css/RGBColor.h

Index: sky/engine/core/css/RGBColor.h
diff --git a/sky/engine/core/css/RGBColor.h b/sky/engine/core/css/RGBColor.h
index 5348eaed1775e0168e22bbd213f083e2f5daac0a..501d550ba52691b53950e43926d66336dcb61c91 100644
--- a/sky/engine/core/css/RGBColor.h
+++ b/sky/engine/core/css/RGBColor.h
@@ -27,7 +27,7 @@
 #ifndef SKY_ENGINE_CORE_CSS_RGBCOLOR_H_
 #define SKY_ENGINE_CORE_CSS_RGBCOLOR_H_
 
-#include "sky/engine/bindings/core/v8/ScriptWrappable.h"
+#include "sky/engine/tonic/dart_wrappable.h"
 #include "sky/engine/platform/graphics/Color.h"
 #include "sky/engine/platform/heap/Handle.h"
 #include "sky/engine/wtf/RefCounted.h"
@@ -36,7 +36,7 @@ namespace blink {
 
 class CSSPrimitiveValue;
 
-class RGBColor : public RefCounted<RGBColor>, public ScriptWrappableBase {
+class RGBColor : public RefCounted<RGBColor> {
 public:
     static PassRefPtr<RGBColor> create(unsigned rgbColor);