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For tablet mode, we should better use the regular way to launch CCA,
which means opening CCA in a Browser, rather than using CameraDialog so
that the size of the CCA can be fullscreen as well.

Bug: b/175322338, b/175326967, b/174891007
Test: tast run [DUT] camera.CCAUIIntent*
Change-Id: I39cecffb36e4d104253d74ffd9e44c6740a648b5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2596282
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Shik Chen <shik@chromium.org>
Auto-Submit: Wei Lee <wtlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#838170}