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### Issue Details

* **Electron Version:**
9.0.2
* **Operating System:**
  Windows 10
* **Last Known Working Electron version:**
9.0.1
### Expected Behavior
Opening tray icon should not create taskbar item

### Actual Behavior
Empty taskbar item is created when tray icon menu is opened

### To Reproduce
Create tray menu and open it

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### Screenshots
<!-- If applicable, add screenshots to help explain your problem. -->
![tray](https://user-images.githubusercontent.com/6961047/84270140-85346100-ab2a-11ea-9b75-45a40f4c2470.png)

### Additional Information
<!-- Add any other context about the problem here. -->

shell/browser/ui/win/notify_icon.h
HWND window() const { return window_; }
  UINT message_id() const { return message_id_; }
  GUID guid() const { return guid_; }
  
  void SetImage(HICON image) override;
  void SetPressedImage(HICON image) override;
  void SetToolTip(const std::string& tool_tip) override;
  void DisplayBalloon(const BalloonOptions& options) override;
  void RemoveBalloon() override;
  void Focus() override;
  void PopUpContextMenu(const gfx::Point& pos,
                        ElectronMenuModel* menu_model) override;
  void CloseContextMenu() override;
  void SetContextMenu(ElectronMenuModel* menu_model) override;
  gfx::Rect GetBounds() override;