Remove almost all of Oilpan

sky/engine/core/frame/EventHandlerRegistry.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EventHandlerRegistry_h
 #define EventHandlerRegistry_h
 
 #include "core/frame/FrameHost.h"
 #include "wtf/HashCountedSet.h"
 
@@ skipping 41 matching lines @@
     void didMoveIntoFrameHost(EventTarget&);
     void didMoveOutOfFrameHost(EventTarget&);
     static void didMoveBetweenFrameHosts(EventTarget&, FrameHost* oldFrameHost, FrameHost* newFrameHost);
 
     // Either |documentDetached| or |didMove{Into,OutOf,Between}FrameHosts| must
     // be called whenever the FrameHost that is associated with a registered event
     // target changes. This ensures the registry does not end up with stale
     // references to handlers that are no longer related to it.
     void documentDetached(Document&);
 
-    void trace(Visitor*);
-    void clearWeakMembers(Visitor*);
-
 private:
     enum ChangeOperation {
         Add, // Add a new event handler.
         Remove, // Remove an existing event handler.
         RemoveAll // Remove any and all existing event handlers for a given target.
     };
 
     // Returns true if |eventType| belongs to a class this registry tracks.
     static bool eventTypeToClass(const AtomicString& eventType, EventHandlerClass* result);
 
@@ skipping 22 matching lines @@
 
     void checkConsistency() const;
 
     FrameHost& m_frameHost;
     EventTargetSet m_targets[EventHandlerClassCount];
 };
 
 } // namespace blink
 
 #endif // EventHandlerRegistry_h