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Previously Assistant cards were rendered using WebContentsManager.
This did not support either single- or multi-process mash.

After this CL, I'll do a follow up to remove WebContentsManager and
AnswerCardContentsRegistry as they are no longer used by either
Assistant nor AppList.

Known issue: This works fine for single-process mash but a crash
occurs in multi-process mash when testing on device. No crash occurs
with a glinux build so need to do more debugging. That said, this
still moves us forward and allows us to deprecate some classes :)

Bug: b:78078693
Change-Id: Iae0e9de8e5291f0ac99bae12207483838ccb910e
Reviewed-on: https://chromium-review.googlesource.com/c/1321861
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Tom Sepez <tsepez@chromium.org>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#607030}