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When the user manually zooms, any page fitting (e.g. fit-to-width) is
unset and subsequent window resizes do not change zoom. This was not
being done for the PDF viewer's internal pinch zoom mechanism.

Bug: 1123976
Change-Id: Ifcc2b14fb05b7a339a7463d89f9a00c00739a43a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2392700Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Kevin McNee <mcnee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804447}