DEPS.xwalk: Roll chromium-crosswalk (5ee6f9b -> 66c669a).

* 66c669a Merge pull request #194 from rakuco/apply-oz-wl-vt-patch
* c1470fd [Temp] Apply ozone-wayland's 0008-Fix-crash-when-switching-to-console-VT-mode.patch.
* df6b8b1 Merge pull request #192 from pozdnyakov/setShrinksViewportContentToFit
* b83a40a [Tizen] Make content fit to the viewport
* 9245a9b Merge pull request #191 from nagineni/pulseaudio
* 631b0d9 Revert "[TIZEN] Tag the audio stream as "browser" in pulseaudio."

c1470fd is required to fix even more Tizen IVI problems.