[ios] Fixes PasswordSettingsTestCase.testExportFlow on iOS13 iPad.

BUG=983143

Change-Id: I7d0a681115bf9b2dce6a4fb4c3ea7d501ede9f6f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1709935
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Commit-Queue: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#679164}
1 file changed