Remove more oilpan.

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

Index: sky/engine/core/html/canvas/WebGLFramebuffer.h
diff --git a/sky/engine/core/html/canvas/WebGLFramebuffer.h b/sky/engine/core/html/canvas/WebGLFramebuffer.h
index 5507b7e5c451acc5af36e28c3c01779999ebfb5f..43eece1dea40731fcb3624cd570e8c92ade5b77b 100644
--- a/sky/engine/core/html/canvas/WebGLFramebuffer.h
+++ b/sky/engine/core/html/canvas/WebGLFramebuffer.h
@@ -29,8 +29,10 @@
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/html/canvas/WebGLContextObject.h"
 #include "core/html/canvas/WebGLSharedObject.h"
+#include "wtf/HashMap.h"
 #include "wtf/PassRefPtr.h"
 #include "wtf/RefCounted.h"
+#include "wtf/Vector.h"
 
 namespace blink {
 
@@ -59,8 +61,6 @@ public:
         virtual void attach(blink::WebGraphicsContext3D*, GLenum attachment) = 0;
         virtual void unattach(blink::WebGraphicsContext3D*, GLenum attachment) = 0;
 
-        virtual void trace(Visitor*) { }
-
     protected:
         WebGLAttachment();
     };
@@ -102,8 +102,6 @@ public:
 
     GLenum getDrawBuffer(GLenum);
 
-    virtual void trace(Visitor*) override;
-
 protected:
     explicit WebGLFramebuffer(WebGLRenderingContextBase*);