Always shows window frame except for maximized window on Unity.
win: Setup font.
Refactor the AddPakPaths to make it possible to set pak's scale factor.

This is needed when adding high DPI resources.
win: Fix window frame on detached window.
Fix crash when closing docked devtools by clicking close button.

We need to send ack for the close message, so we should destroy web contents
after the beforeunload event has fired.
views: Use DesktopNativeWidgetAura for menu view.
Merge pull request #62 from brightray/window-frame

Some tweaks on making application looks better