[CMAKE] ENABLE_ENCRYPTED_MEDIA_V2 should depend on ENABLE_VIDEO
https://bugs.webkit.org/show_bug.cgi?id=134963

Reviewed by Gyuyoung Kim.

ENCRYPTED_MEDIA_V2 requires VIDEO enabled.

* Source/cmake/WebKitFeatures.cmake: Added the dependency for ENABLE_ENCRYPTED_MEDIA_V2.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@171139 268f45cc-cd09-0410-ab3c-d52691b4dbfc