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A unique_ptr<> was used inside a std::map, but std::map values are
already stable in memory. We can directly store TabGroupData values
without indirection and still hand out TabGroupData pointers.

Bug: 905491
Change-Id: I250b156e56dc400a83374e57e06958fa5f06864f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1719446
Commit-Queue: Bret Sepulveda <bsep@chromium.org>
Reviewed-by: Bret Sepulveda <bsep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681069}