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This reverts commit 8fd7b85d.

Reason for revert: relanding after creating fix for M88

Original change's description:
> Revert "Support Arc, crostini, and Plugin VM in drag drop FileHelper"
>
> This reverts commit 54e85384.
>
> Reason for revert: Reverting in order to create a patch for M88.
>
> Original change's description:
> > Support Arc, crostini, and Plugin VM in drag drop FileHelper
> >
> > The current code in FileHelper assumes all windows are Arc. We now
> > check the source and target aura::Window to detect and do the
> > appropriate path translations and share files when necessary with
> > crostini/pluginvm.
> >
> > For example, when crostini is the drag source, we will convert paths
> > such as:
> >
> >  <homedir>/file => /media/fuse/crostini_<hash>_termina_penguin/file
> >
> > And do the opposite translation when crostini is the drop target.
> >
> > We also convert paths and share files such as:
> >
> >  <cryptohome>/MyFiles/file => /mnt/chromeos/MyFiles/file
> >  /media/removable/MyUSB => /mnt/chromeos/removable/MyUSB
> >
> > For PluginVM, the translation is
> >
> >  <cryptohome>/MyFiles/file => //ChromeOS/MyFiles/file
> >  /media/removable/MyUSB => //ChromeOS/removable/MyUSB
> >
> > Bug: 1144138
> > Change-Id: I2bb38336537acf13c4797374d6dabe6e518d689e
> > Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517346
> > Commit-Queue: Joel Hockey <joelhockey@chromium.org>
> > Reviewed-by: Jason Lin <lxj@google.com>
> > Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
> > Cr-Commit-Position: refs/heads/master@{#827956}
>
> TBR=oshima@chromium.org,joelhockey@chromium.org,niwa@chromium.org,lxj@google.com
>
> # Not skipping CQ checks because original CL landed > 1 day ago.
>
> Bug: 1144138
> Change-Id: I212ae8759e9069e52837fd1bc324ea5f9046b6b5
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2547743
> Reviewed-by: Joel Hockey <joelhockey@chromium.org>
> Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
> Commit-Queue: Joel Hockey <joelhockey@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#829031}

TBR=oshima@chromium.org,joelhockey@chromium.org,niwa@chromium.org,lxj@google.com

# Not skipping CQ checks because this is a reland.

Bug: 1144138
Change-Id: I0a735fb4e17679f735c11ecab427f7ba624db399
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2547844Reviewed-by: Joel Hockey <joelhockey@chromium.org>
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#829065}