Remove more oilpan.

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

Index: sky/engine/core/html/canvas/WebGLVertexArrayObjectOES.cpp
diff --git a/sky/engine/core/html/canvas/WebGLVertexArrayObjectOES.cpp b/sky/engine/core/html/canvas/WebGLVertexArrayObjectOES.cpp
index fb7aab351545c1dfad168dca5c266e96f6d29ae3..cd46e238b3ece7dcf7a27116a0f47fc5dd73a2a8 100644
--- a/sky/engine/core/html/canvas/WebGLVertexArrayObjectOES.cpp
+++ b/sky/engine/core/html/canvas/WebGLVertexArrayObjectOES.cpp
@@ -162,16 +162,4 @@ void WebGLVertexArrayObjectOES::setVertexAttribDivisor(GLuint index, GLuint divi
     state.divisor = divisor;
 }
 
-void WebGLVertexArrayObjectOES::VertexAttribState::trace(Visitor* visitor)
-{
-    visitor->trace(bufferBinding);
-}
-
-void WebGLVertexArrayObjectOES::trace(Visitor* visitor)
-{
-    visitor->trace(m_boundElementArrayBuffer);
-    visitor->trace(m_vertexAttribState);
-    WebGLContextObject::trace(visitor);
-}
-
 }