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/+/2547743Reviewed-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}

chrome/browser/chromeos/crostini/crostini_util.cc

@@ -6,7 +6,6 @@
 
 #include <utility>
 
-#include "ash/public/cpp/app_types.h"
 #include "base/bind.h"
 #include "base/callback.h"
 #include "base/callback_helpers.h"
@@ -45,7 +44,6 @@
 #include "components/prefs/pref_service.h"
 #include "components/user_manager/user.h"
 #include "google_apis/gaia/gaia_auth_util.h"
-#include "ui/aura/client/aura_constants.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/base/l10n/time_format.h"
 
@@ -576,10 +574,4 @@ const ContainerId& DefaultContainerId() {
       kCrostiniDefaultVmName, kCrostiniDefaultContainerName);
   return *container_id;
 }
-
-bool IsCrostiniWindow(aura::Window* window) {
-  return window->GetProperty(aura::client::kAppType) ==
-         static_cast<int>(ash::AppType::CROSTINI_APP);
-}
-
 }  // namespace crostini

chrome/browser/chromeos/crostini/crostini_util.h

@@ -18,10 +18,6 @@
 #include "storage/browser/file_system/file_system_url.h"
 #include "third_party/abseil-cpp/absl/types/variant.h"
 
-namespace aura {
-class Window;
-}  // namespace aura
-
 namespace base {
 class FilePath;
 }  // namespace base
@@ -209,8 +205,6 @@ void UpdateContainerPref(Profile* profile,
 
 const ContainerId& DefaultContainerId();
 
-bool IsCrostiniWindow(aura::Window* window);
-
 }  // namespace crostini
 
 #endif  // CHROME_BROWSER_CHROMEOS_CROSTINI_CROSTINI_UTIL_H_