Remove tons of OILPAN.

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

Index: sky/engine/core/html/canvas/WebGLRenderingContextBase.h
diff --git a/sky/engine/core/html/canvas/WebGLRenderingContextBase.h b/sky/engine/core/html/canvas/WebGLRenderingContextBase.h
index 6a55fb7ee99b62e87702caa887ffdd4a3283aff8..e898dab046fe6876523f54a64cf0b5f4b2302f30 100644
--- a/sky/engine/core/html/canvas/WebGLRenderingContextBase.h
+++ b/sky/engine/core/html/canvas/WebGLRenderingContextBase.h
@@ -355,15 +355,11 @@ public:
 
     void setSavingImage(bool isSaving) { m_savingImage = isSaving; }
 
-    virtual void trace(Visitor*) override;
-
     class TextureUnitState {
         ALLOW_ONLY_INLINE_ALLOCATION();
     public:
         RefPtr<WebGLTexture> m_texture2DBinding;
         RefPtr<WebGLTexture> m_textureCubeMapBinding;
-
-        void trace(Visitor*);
     };
 
 protected:
@@ -599,8 +595,6 @@ protected:
         virtual const char* extensionName() const = 0;
         virtual void loseExtension() = 0;
 
-        virtual void trace(Visitor*) { }
-
     private:
         bool m_draft;
         const char* const* m_prefixes;
@@ -653,12 +647,6 @@ protected:
             }
         }
 
-        virtual void trace(Visitor* visitor) override
-        {
-            visitor->trace(m_extension);
-            ExtensionTracker::trace(visitor);
-        }
-
     private:
         TypedExtensionTracker(RefPtr<T>& extensionField, ExtensionFlags flags, const char* const* prefixes)
             : ExtensionTracker(flags, prefixes)