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Before, this happened by default. However, this was confusing, so now
there are two separate flags, so zoom can be enabled without changing
the default zoom level.

Bug: 1113270
Change-Id: I34e340c585c5ccccdfd278d96c21a53510b6a234
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339482
Commit-Queue: Robbie Gibson <rkgibson@google.com>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795408}