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This restriction comes from ReadingListModel's implementation.

Bug: 1117023
Change-Id: Ibc3f05b7d9523e1dde3661a9559936adb12c52f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2399015
Commit-Queue: Caroline Rising <corising@chromium.org>
Reviewed-by: Peter Boström <pbos@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805372}