Revert "CrOS FilesApp: Share crostini entries before opening"

This reverts commit dec38a719c28709cbad53804e18db9e96a121c21.

Reason for revert: Crashes browser_tests.

Example:
https://logs.chromium.org/logs/chromium/buildbucket/cr-buildbucket.appspot.com/8933735011043353616/+/steps/browser_tests/0/stdout

Original change's description:
> CrOS FilesApp: Share crostini entries before opening
> 
> When a user opens files within Downloads using a crostini app,
> show a dialog for the user to give permission to share the
> directory that the files are in with crostini.
> 
> * Move handling of 'crostin-files' flag checking into
>   foreground/js/crostini.js
> * Change FileTasks.executeInternal to detect files that
>   can be shared with crostini and do sharing before execute.
> * UI Test verifies share dialog is shown before execute.
> * ConvertFileSystemURLToPathInsideCrostini maps
>   path from within Downloads to '/ChromeOS/Downloads/...'
> 
> Bug: 878324
> Change-Id: Ie88090ff958dd201aeacb23fdfcc84a4f3d20210
> Reviewed-on: https://chromium-review.googlesource.com/c/1243871
> Reviewed-by: Nicholas Verne <nverne@chromium.org>
> Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
> Commit-Queue: Joel Hockey <joelhockey@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#596003}

TBR=timloh@chromium.org,joelhockey@chromium.org,nverne@chromium.org,lucmult@chromium.org

Change-Id: I553be4bfe6c0fad8435383c70b44a420237b250b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 878324
Reviewed-on: https://chromium-review.googlesource.com/c/1258622
Reviewed-by: Alexey Baskakov <loyso@chromium.org>
Commit-Queue: Alexey Baskakov <loyso@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596067}
19 files changed