Fix wrong cast in ExtensionsGuestViewContainer.

extensions/renderer/guest_view/extensions_guest_view_container.h

Index: extensions/renderer/guest_view/extensions_guest_view_container.h
diff --git a/extensions/renderer/guest_view/extensions_guest_view_container.h b/extensions/renderer/guest_view/extensions_guest_view_container.h
index bc95b187f8001d89c9bd74ee1d1115072cc6d3f4..c448cd3005401bde6c40be18bd84fd3cd793f3cd 100644
--- a/extensions/renderer/guest_view/extensions_guest_view_container.h
+++ b/extensions/renderer/guest_view/extensions_guest_view_container.h
@@ -21,27 +21,13 @@ class ExtensionsGuestViewContainer : public guest_view::GuestViewContainer {
  public:
   explicit ExtensionsGuestViewContainer(content::RenderFrame* render_frame);
 
-  void RegisterElementResizeCallback(v8::Local<v8::Function> callback,
-                                     v8::Isolate* isolate);
-
-  // BrowserPluginDelegate implementation.
-  void DidResizeElement(const gfx::Size& new_size) override;
-
  protected:
   ~ExtensionsGuestViewContainer() override;
 
  private:
-  void CallElementResizeCallback(const gfx::Size& new_size);
-
   // GuestViewContainer implementation.
   void OnDestroy(bool embedder_frame_destroyed) override;
 
-  v8::Global<v8::Function> element_resize_callback_;
-  v8::Isolate* element_resize_isolate_;
-
-  // Weak pointer factory used for calling the element resize callback.
-  base::WeakPtrFactory<ExtensionsGuestViewContainer> weak_ptr_factory_;
-
   DISALLOW_COPY_AND_ASSIGN(ExtensionsGuestViewContainer);
 };