Log Message:
webkit-gtk: Update to 2.28.2

Changes:
2.28.2
======
 - Fix excessive CPU usage due to GdkFrameClock not being stopped.
 - Fix UI process crash when EGL_WL_bind_wayland_display extension is
   not available.
 - Fix position of select popup menus in X11.
 - Fix playing of Youtube 'live stream'/H264 URLs.
 - Fix a crash under X11 when cairo uses xcb.
 - Fix the build in MIPS64.
 - Fix several crashes and rendering issues.