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* Electron version: 1.6.10
* Operating system: Windows 7

### Expected behavior

<!-- What do you think should happen? -->

Notification size should be smaller, similar to the one you can just see in the screenshot below that you can just see the bottom of, behind the large notification.


### Actual behavior

<!-- What actually happens? -->

The new notifications for windows 7 are taking up half of the screen space as seen in the image below:
![image](https://cloud.githubusercontent.com/assets/5689874/26761521/f2eec2c4-4928-11e7-9572-6df74ddb7ad1.png)

I'm running windows in parallels on a mac, so I expect it to be a screen resolution issue (2880x1800)



### How to reproduce

Test notifications on Windows 7 with parallels on a mac, or use Windows with a high screen resolution (e.g. 2880x1800).

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brightray/browser/win/win32_desktop_notifications/desktop_notification_controller.cc
_ASSERT(hwnd_controller_);
    if (!is_animating_ && hwnd_controller_) {
        
        
        
        SetTimer(hwnd_controller_, TimerID_Animate, 15, nullptr);
        is_animating_ = true;
    }
}
HFONT DesktopNotificationController::GetCaptionFont() {