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This change is behind kReadLater feature flag. Originally closing the
tab after it was added to read later was the desired behavior. Based on
fishfood feedback we have changed this decision and want tabs to remain
open after being added to read later.

Bug: 1117023, 1117023
Change-Id: I84bcf1d2203a950c62c56ac4fb1f0e8cb2f99f1a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2498103Reviewed-by: Peter Boström <pbos@chromium.org>
Commit-Queue: Caroline Rising <corising@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821194}