Remove tons of OILPAN.

sky/engine/core/html/canvas/CanvasStyle.cpp

Index: sky/engine/core/html/canvas/CanvasStyle.cpp
diff --git a/sky/engine/core/html/canvas/CanvasStyle.cpp b/sky/engine/core/html/canvas/CanvasStyle.cpp
index c8576e03604203f5c55ee91e23acd2acebf75609..788a2345e8e49f0acf3c93ff1c28dcd501541b06 100644
--- a/sky/engine/core/html/canvas/CanvasStyle.cpp
+++ b/sky/engine/core/html/canvas/CanvasStyle.cpp
@@ -272,10 +272,4 @@ void CanvasStyle::applyFillColor(GraphicsContext* context)
     }
 }
 
-void CanvasStyle::trace(Visitor* visitor)
-{
-    visitor->trace(m_gradient);
-    visitor->trace(m_pattern);
-}
-
 }