Move DownloadInfo from chrome/android to chrome/browser/download

This CL moves DownloadInfo from chrome/android to
chrome/browser/download.
DownloadInfo.CreateOfflineItem() is removed as callers should
now use DownloadItem.CreateOfflineItem()

BUG=1013759

Change-Id: I71d9e8227a612830c2ce9a9e6c7c08fea3dcabd9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1879783
Commit-Queue: Min Qin <[email protected]>
Reviewed-by: Shakti Sahu <[email protected]>
Reviewed-by: David Trainor <[email protected]>
Cr-Commit-Position: refs/heads/master@{#709654}
17 files changed