GitLab

This CL fixes
1 - Overall OMA download flow for DownloadOfflineContentProvider
2 - Fix auto-open for downloads that should be auto-opened immediately.
3 - Fixed a bug, where OMA mistakenly assumes the given download path
and queries mime type from it, rather than content Uri, since the
given file path and actual file path can be different.

Bug: 989110
Change-Id: I7bad385f0a72d40b555e94b47ee760377519e6e0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1727382Reviewed-by: Min Qin <qinmin@chromium.org>
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#682842}