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showOnLeft_ was updated to be computed based on whether the viewer was
in Print Preview, which is set at construction rather than after
retrieving strings from the backend. As a result, the document text
direction was not yet set and the computation returned the wrong
result.

Instead, compute show on left one time when strings are set, since
neither isPrintPreview nor the document direction should change while
the viewer is open.

Fixed: 1017081
Change-Id: I849af87b361d889f1655d9d2bdb04b16fcffe454
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1877816Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709221}