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Currently ArcCustomTabs is enabled by default with no easy way (ie no
longer listed in chrome://flags) for the user to disable, this shouldn't
be an issue but due to stability concerns it would be better to assume a
safer approach, this CL does that by marking such feature as
DISABLED_BY_DEFAULT.

Bug: 1065124
Test: Build.
Change-Id: I0682b05629bc5892ad04871f244f3e3b7119dcf7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2506151
Auto-Submit: David Jacobo <djacobo@chromium.org>
Reviewed-by: Yusuke Sato <yusukes@chromium.org>
Commit-Queue: David Jacobo <djacobo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821903}