Move ResourceOwner on to the oilpan heap.

third_party/WebKit/Source/core/fetch/ResourceOwner.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 19 matching lines @@
 
 #ifndef ResourceOwner_h
 #define ResourceOwner_h
 
 #include "core/fetch/ResourcePtr.h"
 
 namespace blink {
 
 
 template<class R, class C = typename R::ClientType>
-class ResourceOwner : public C {
+class ResourceOwner : public WillBeGarbageCollectedMixin, public C {
 public:
     using ResourceType = R;
 
-    virtual ~ResourceOwner();
+    virtual ~ResourceOwner() { clearResource(); }

[yhirano, 2016/01/12 07:54:49]

You cannot call clearResource() in the destructor when ResourceOwner is on-heap.
How about using pre-finalizer?

[Nate Chapin, 2016/01/13 20:36:33]

Done.

     ResourceType* resource() const { return m_resource.get(); }
 
 protected:
-    ResourceOwner();
-    ResourceOwner(const ResourceOwner& other) { setResource(other.resource()); }
-    explicit ResourceOwner(const ResourcePtr<ResourceType>&);
+    ResourceOwner() {}
 
     void setResource(const ResourcePtr<ResourceType>&);
-    void clearResource();
-
-    ResourceOwner& operator=(const ResourceOwner& other);
+    void clearResource() { setResource(nullptr); }
 
 private:
     ResourcePtr<ResourceType> m_resource;
 };
 
 template<class R, class C>
-inline ResourceOwner<R, C>::ResourceOwner()
-{
-}
-
-template<class R, class C>
-inline ResourceOwner<R, C>::~ResourceOwner()
-{
-    clearResource();
-}
-
-template<class R, class C>
-inline ResourceOwner<R, C>::ResourceOwner(const ResourcePtr<R>& resource)
-    : m_resource(resource)
-{
-    if (m_resource)
-        m_resource->addClient(this);
-}
-
-template<class R, class C>
 inline void ResourceOwner<R, C>::setResource(const ResourcePtr<R>& newResource)
 {
     if (newResource == m_resource)
         return;
 
     // Some ResourceClient implementations reenter this so
     // we need to prevent double removal.
     if (ResourcePtr<ResourceType> oldResource = m_resource) {
         m_resource.clear();
         oldResource->removeClient(this);
     }
 
     if (newResource) {
         m_resource = newResource;
         m_resource->addClient(this);
     }
 }
 
-template<class R, class C>
-inline void ResourceOwner<R, C>::clearResource()
-{
-    setResource(0);
-}
-
-template<class R, class C>
-inline ResourceOwner<R, C>& ResourceOwner<R, C>::operator=(const ResourceOwner<R, C>& other)
-{
-    if (this == &other)
-        return *this;
-    setResource(other.resource());
-    return *this;
-}
-
 } // namespace blink
 
 #endif