CompositorWorkerProxyClientImpl to CompositorProxy cross thread reference is using WeakMember

third_party/WebKit/Source/web/AnimationWorkletProxyClientImpl.cpp

 // Copyright 2016 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.
 
 #include "web/AnimationWorkletProxyClientImpl.h"
 
 #include "core/dom/CompositorProxy.h"
 #include "platform/graphics/CompositorMutableStateProvider.h"
 #include "web/CompositorMutatorImpl.h"
 
 namespace blink {
 
 AnimationWorkletProxyClientImpl::AnimationWorkletProxyClientImpl(
     CompositorMutatorImpl* mutator)
     : m_mutator(mutator) {
   DCHECK(isMainThread());
 }
 
 DEFINE_TRACE(AnimationWorkletProxyClientImpl) {
-  visitor->trace(m_proxies);
   AnimationWorkletProxyClient::trace(visitor);
   CompositorAnimator::trace(visitor);
 }
 
 bool AnimationWorkletProxyClientImpl::mutate(
     double monotonicTimeNow,
     CompositorMutableStateProvider* provider) {
   DCHECK(!isMainThread());
   // TODO(majidvp): actually call JS |animate| callbacks.
 
   // Always request another rAF for now.
   return true;
 }
 
-void AnimationWorkletProxyClientImpl::registerCompositorProxy(
-    CompositorProxy* proxy) {
-  DCHECK(!isMainThread());
-  m_proxies.insert(proxy);
-}
-
-void AnimationWorkletProxyClientImpl::unregisterCompositorProxy(
-    CompositorProxy* proxy) {
-  DCHECK(!isMainThread());
-  m_proxies.erase(proxy);
-}
-
 }  // namespace blink