[GTK] Enable VIDEO_TRACK by default
https://bugs.webkit.org/show_bug.cgi?id=134801

Reviewed by Philippe Normand.

* Source/cmake/OptionsGTK.cmake:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@170997 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Unreviewed. Remove unused file.

* html/shadow/MediaControlsGtk.h: Removed.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@170998 268f45cc-cd09-0410-ab3c-d52691b4dbfc
Unreviewed, rolling out r170995.
https://bugs.webkit.org/show_bug.cgi?id=134831

Causing odd crashes in debug builds (Requested by zdobersek on
#webkit).

Reverted changeset:

"[WTF] Add the move constructor, move assignment operator for
HashTable"
https://bugs.webkit.org/show_bug.cgi?id=130772
http://trac.webkit.org/changeset/170995

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@170999 268f45cc-cd09-0410-ab3c-d52691b4dbfc