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+ Move tab management resources into its DFM.

Bug: 944115
Change-Id: If14cdcfeb6bca94b9f1b040049c0f659831b193b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1534777Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Peter Wen <wnwen@chromium.org>
Reviewed-by: Yusuf Ozuysal <yusufo@chromium.org>
Commit-Queue: Tibor Goldschwendt <tiborg@chromium.org>
Auto-Submit: Tibor Goldschwendt <tiborg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#646437}