Remove more oilpan.

sky/engine/core/html/canvas/WebGLVertexArrayObjectOES.h

Index: sky/engine/core/html/canvas/WebGLVertexArrayObjectOES.h
diff --git a/sky/engine/core/html/canvas/WebGLVertexArrayObjectOES.h b/sky/engine/core/html/canvas/WebGLVertexArrayObjectOES.h
index 1d91054ff412793d1b095717d5db6a117c1bf566..502b54f028c38bd76d175f937fe2e3e472540d37 100644
--- a/sky/engine/core/html/canvas/WebGLVertexArrayObjectOES.h
+++ b/sky/engine/core/html/canvas/WebGLVertexArrayObjectOES.h
@@ -29,8 +29,9 @@
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/html/canvas/WebGLBuffer.h"
 #include "core/html/canvas/WebGLContextObject.h"
-#include "platform/heap/Handle.h"
+#include "wtf/RefCounted.h"
 #include "wtf/PassRefPtr.h"
+#include "wtf/Vector.h"
 
 namespace blink {
 
@@ -63,8 +64,6 @@ public:
         {
         }
 
-        void trace(Visitor*);
-
         bool enabled;
         RefPtr<WebGLBuffer> bufferBinding;
         GLsizei bytesPerElement;
@@ -90,8 +89,6 @@ public:
     void unbindBuffer(PassRefPtr<WebGLBuffer>);
     void setVertexAttribDivisor(GLuint index, GLuint divisor);
 
-    virtual void trace(Visitor*) override;
-
 private:
     WebGLVertexArrayObjectOES(WebGLRenderingContextBase*, VaoType);