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Web tests set page zoom on every RenderView's main frame, but some may
be holding a remote main frame. Don't try to set page zoom on those ones
and let the page zoom propagate from the main frame down to those
RenderViews and their child frames.

R=avi@chromium.org

Bug: 1006580
Change-Id: I411b9cd8d21f16e03649c9c716a3e6d1e7fc271e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1823317Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#699963}