Update to 2.4.4:

=================
WebKitGTK+  2.4.4
=================

What's new in WebKitGTK+ 2.4.4?

  - Fix annoying popup shown when visiting 8tracks.com.
  - Expose links rendered as blocks to accessibility.
  - Make text inside "span" block in "a" block accessible.
  - Implement windowed plugins visibility.
  - Fix the GObject introspection annotations of webkit_web_resource_get_data_finish().
  - Fix a crash in TSymbolTableLevel::~TSymbolTableLevel when WebKit
    is built with GCC 4.9.
  - Fix a crash when playing a video in facebook.
  - Several user agent changes to fix Google Maps and a few other issues.
  - Allo to include WebKitVersion.h from web extensions API too.
  - Fix web process leak when closing pages with network process enabled.
  - Fix the build with --disable-webgl --disable-accelerated-compositing.