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Both TabRestoreService and SessionService support tab groups, but
restoring a window after a browser restart did not restore
groups. This was because the code translating SessionService entries
to TabRestoreService entries did not copy over group data.

Adds the necessary code to restore groups correctly. This allows, for
example, restoring a recent window with groups after a browser crash.

Fixed: 1168751
Change-Id: I6510ab036caa1450f904ea7e1209885acf08682d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2641334Reviewed-by: Scott Violet <sky@chromium.org>
Commit-Queue: Collin Baker <collinbaker@chromium.org>
Cr-Commit-Position: refs/heads/master@{#845702}