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Also remove DOWNLOAD_TAB_MANAGEMENT_MODULE since it becomes unused.

Bug: 1012975
Change-Id: I8a687bc395ebb1d0f775eb7b83321047ba4ecb52
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1863033Reviewed-by: Wei-Yin Chen (陳威尹) <wychen@chromium.org>
Reviewed-by: Yusuf Ozuysal <yusufo@chromium.org>
Commit-Queue: Henrique Nakashima <hnakashima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#709045}