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As internal build has been changed to always require building MDC
as a framework, change the default to build MDC in that mode.

Bug: 1073377
Change-Id: Idb81adc11a82495c322da9ef3fcc7f1910f38567
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2159716Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Commit-Queue: Sylvain Defresne <sdefresne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#762310}