Oilpan: Move FrameLoaderClient class hierarchy into Oilpan heap.

Source/web/FrameLoaderClientImpl.h

Index: Source/web/FrameLoaderClientImpl.h
diff --git a/Source/web/FrameLoaderClientImpl.h b/Source/web/FrameLoaderClientImpl.h
index b2a6b9d1892877d2620aab1067dff2ba23e4c520..c70029a0c0d169398355966845d6c493148068cf 100644
--- a/Source/web/FrameLoaderClientImpl.h
+++ b/Source/web/FrameLoaderClientImpl.h
@@ -45,10 +45,13 @@ class WebPluginLoadObserver;
 
 class FrameLoaderClientImpl final : public FrameLoaderClient {
 public:
-    explicit FrameLoaderClientImpl(WebLocalFrameImpl* webFrame);
+    static PassOwnPtrWillBeRawPtr<FrameLoaderClientImpl> create(WebLocalFrameImpl*);
+
     ~FrameLoaderClientImpl() override;
 
-    WebLocalFrameImpl* webFrame() const { return m_webFrame; }
+    DECLARE_VIRTUAL_TRACE();
+
+    WebLocalFrameImpl* webFrame() const { return m_webFrame.get(); }
 
     // FrameLoaderClient ----------------------------------------------
 
@@ -180,14 +183,17 @@ public:
     unsigned backForwardLength() override;
 
     void suddenTerminationDisablerChanged(bool present, SuddenTerminationDisablerType) override;
+
 private:
+    explicit FrameLoaderClientImpl(WebLocalFrameImpl*);
+
     bool isFrameLoaderClientImpl() const override { return true; }
 
     PassOwnPtr<WebPluginLoadObserver> pluginLoadObserver(DocumentLoader*);
 
     // The WebFrame that owns this object and manages its lifetime. Therefore,
     // the web frame object is guaranteed to exist.
-    WebLocalFrameImpl* m_webFrame;
+    RawPtrWillBeMember<WebLocalFrameImpl> m_webFrame;
 };
 
 DEFINE_TYPE_CASTS(FrameLoaderClientImpl, FrameLoaderClient, client, client->isFrameLoaderClientImpl(), client.isFrameLoaderClientImpl());