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Move Download settings to org.chromium.chrome.browser.download package.
This package rename will be followed by modularization
(crbug.com/1047896).

Bug: 1047357
Change-Id: Iaa12fab75234a1f51f4429536ad867eedebf26c6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2076440Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Natalie Chouinard <chouinard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749411}