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There are multiple datatypes that are platform-dependent and
nevertheless the types and enum values are compiled (no ifdef).

This patch does the same for READING_LIST which is no different.

Bug: 950874
Change-Id: I5598d1e7b221c1f4a1338bb83397066c2b79be60
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1893198
Auto-Submit: Mikel Astiz <mastiz@chromium.org>
Commit-Queue: Mikel Astiz <mastiz@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Cr-Commit-Position: refs/heads/master@{#712490}