Oilpan: Move FrameLoaderClient class hierarchy into Oilpan heap.

Source/web/RemoteFrameClientImpl.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 RemoteFrameClientImpl_h
 #define RemoteFrameClientImpl_h
 
 #include "core/frame/RemoteFrameClient.h"
 
 namespace blink {
 class WebRemoteFrameImpl;
 
 class RemoteFrameClientImpl final : public RemoteFrameClient {
 public:
-    explicit RemoteFrameClientImpl(WebRemoteFrameImpl*);
+    static PassOwnPtrWillBeRawPtr<RemoteFrameClientImpl> create(WebRemoteFrameImpl*);
+
+    DECLARE_VIRTUAL_TRACE();
 
     // FrameClient overrides:
     bool inShadowTree() const override;
     void willBeDetached() override;
     void detached(FrameDetachType) override;
     Frame* opener() const override;
     void setOpener(Frame*) override;
     Frame* parent() const override;
     Frame* top() const override;
     Frame* previousSibling() const override;
     Frame* nextSibling() const override;
     Frame* firstChild() const override;
     Frame* lastChild() const override;
     bool willCheckAndDispatchMessageEvent(SecurityOrigin*, MessageEvent*, LocalFrame*) const override;
 
     // RemoteFrameClient overrides:
     void navigate(const ResourceRequest&, bool shouldReplaceCurrentEntry) override;
     void reload(FrameLoadType, ClientRedirectPolicy) override;
     unsigned backForwardLength() override;
     void forwardInputEvent(Event*) override;
     void frameRectsChanged(const IntRect& frameRect) override;
 
     WebRemoteFrameImpl* webFrame() const { return m_webFrame; }
 
 private:
-    WebRemoteFrameImpl* m_webFrame;
+    explicit RemoteFrameClientImpl(WebRemoteFrameImpl*);
+
+    RawPtrWillBeMember<WebRemoteFrameImpl> m_webFrame;
 };
 
 } // namespace blink
 
 #endif // RemoteFrameClientImpl_h