GitLab

By inlining GetDownload() into ShowDownloadById() and making
OnGetDownloadDoneForOfflineItem() a member, the code becomes clearer and
more direct (mostly by converting the bound ShowDownload() callback into
direct calls).

Bug: none
Change-Id: I92e424ee658e00aff5fbb243d4b6b574fc6285f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2296001
Commit-Queue: Peter Kasting <pkasting@chromium.org>
Auto-Submit: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#787928}