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Buggy behavior: When moving >=3 tabs in bulk, tabs would get moved farther and farther apart due to this: https://source.chromium.org/chromium/chromium/src/+/master:chrome/browser/extensions/api/tabs/tabs_api.cc;l=1477;drc=9eb09ede880e6cb9f4d58ff003dcd52815b4a45c (The new_index was already being updated to the actual inserted index at each move).

This change is dependent on crrev.com/c/2414994 due to this: https://source.chromium.org/chromium/chromium/src/+/master:chrome/browser/extensions/api/tabs/tabs_api.cc;l=1471;drc=9eb09ede880e6cb9f4d58ff003dcd52815b4a45c

Change-Id: Ib2b61daf56d1b7e4f054cc57b332c4d150e272aa
Bug: None
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2414778Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Connie Wan <connily@chromium.org>
Cr-Commit-Position: refs/heads/master@{#808450}