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Auto-grouping a pinned tab would unpin it, which is likely not what the
person intended.

Bug: 1133147
Change-Id: I504ed6e2117c96f53840a24993fd7891d6b3c30a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2444269Reviewed-by: Charlene Yan <cyan@chromium.org>
Commit-Queue: Peter Boström <pbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813006}