DEPS.xwalk: Roll ozone-wayland (a68f96a -> 7c9ae33)

7c9ae33 Enable HWA decoding support
37aa93e Temporarily remove ozone dependency for gl
c7345e3 Fixed the compile error
740f6c1 Revert "Temporarily disable HWA decoding support"
Temporarily remove ozone dependency for gl

Currently, the ozone-wayland depends on ui/gl. However, that will cause cycling dependency error. So temporarily remove ozone dependency for gl
until we find a better way. Refer to https://github.com/01org/ozone-wayland/issues/240 and https://github.com/01org/ozone-wayland/pull/246