Hollow out more of the tracing system in oilpan

sky/engine/core/css/FontFaceSet.cpp

Index: sky/engine/core/css/FontFaceSet.cpp
diff --git a/sky/engine/core/css/FontFaceSet.cpp b/sky/engine/core/css/FontFaceSet.cpp
index a0dcf1337f7cdcaa2b038323c355cc5ce6c4d6b9..8ded8ce3a11d51a012f98e5e9969a30436959115 100644
--- a/sky/engine/core/css/FontFaceSet.cpp
+++ b/sky/engine/core/css/FontFaceSet.cpp
@@ -62,8 +62,6 @@ public:
     virtual void notifyLoaded(FontFace*) override;
     virtual void notifyError(FontFace*) override;
 
-    virtual void trace(Visitor*) override;
-
 private:
     LoadFontPromiseResolver(FontFaceArray faces, ScriptState* scriptState)
         : m_numLoading(faces.size())
@@ -108,12 +106,6 @@ void LoadFontPromiseResolver::notifyError(FontFace* fontFace)
     }
 }
 
-void LoadFontPromiseResolver::trace(Visitor* visitor)
-{
-    visitor->trace(m_fontFaces);
-    LoadFontCallback::trace(visitor);
-}
-
 class FontsReadyPromiseResolver {
 public:
     static PassOwnPtr<FontsReadyPromiseResolver> create(ScriptState* scriptState)
@@ -588,16 +580,4 @@ void FontFaceSet::didLayout(Document& document)
         fonts->didLayout();
 }
 
-#if ENABLE(OILPAN)
-void FontFaceSet::trace(Visitor* visitor)
-{
-    visitor->trace(m_loadingFonts);
-    visitor->trace(m_loadedFonts);
-    visitor->trace(m_failedFonts);
-    visitor->trace(m_nonCSSConnectedFaces);
-    DocumentSupplement::trace(visitor);
-    EventTargetWithInlineData::trace(visitor);
-}
-#endif
-
 } // namespace blink