Oilpan: move context menu providers to the heap.

Source/core/inspector/InspectorFrontendHost.h

Index: Source/core/inspector/InspectorFrontendHost.h
diff --git a/Source/core/inspector/InspectorFrontendHost.h b/Source/core/inspector/InspectorFrontendHost.h
index 7a64d7f86d2c718714589784fdb9b397ccca0f63..1f1afcc32eaecaea50841dbd444cea0c5340d4ef 100644
--- a/Source/core/inspector/InspectorFrontendHost.h
+++ b/Source/core/inspector/InspectorFrontendHost.h
@@ -75,13 +75,14 @@ public:
 
     Page* frontendPage() { return m_frontendPage; }
 
+    void clearMenuProvider() { m_menuProvider = nullptr; }
+
 private:
-    friend class FrontendMenuProvider;
     InspectorFrontendHost(InspectorFrontendClient* client, Page* frontendPage);
 
     InspectorFrontendClient* m_client;
     RawPtrWillBeMember<Page> m_frontendPage;
-    FrontendMenuProvider* m_menuProvider;
+    RawPtrWillBeMember<FrontendMenuProvider> m_menuProvider;
 };
 
 } // namespace blink