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This change will prepare the tests to allow setting PrinterStatus flag
to enabled by default.

Update the script in PDFPluginNotKeyboardFocusable to focus the
destination_select element.

Make NativeLayerStub return an empty JSON for printer status when the
printer_id isn't found.

Set the flag to always disabled in
PrintPreviewDestinationSelectTestCrOS. The equivalent of these tests
will run in PrinterStatusTestCros with the flag enabled.

Bug: 1059607
Change-Id: I49e2f3d133434c4c5c1770971271074e9f45ab19
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2298030Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Commit-Queue: Gavin Williams <gavinwill@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791239}