Re-enable all crostini Tast tests on Chrome bots.

The bots are now successfully downloading the needed test artifacts
thanks to luci-context setting up task-specific boto file + env var.

Bug: 1000351, 1054340, 1006681
Change-Id: I89abf71b655747b206aeba2fddbdd3d5b2daf740
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2115774
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#754552}

chromeos/BUILD.gn

@@ -264,13 +264,6 @@ if (is_chromeos_device) {
   tast_test("chrome_all_tast_tests") {
     # To disable a specific test, add it the following list and cite a bug.
     tast_disabled_tests = [
-      # crbug.com/1000351
-      "crostini.Sanity.artifact",
-
-      # crbug.com/1006681
-      "crostini.GPUEnabledDownload",
-      "crostini.SanityDownload",
-
       # crbug.com/1051059
       "security.SELinuxProcessesARC",
 
@@ -278,31 +271,6 @@ if (is_chromeos_device) {
       "security.NetworkListenersARC",
       "security.NetworkListenersNonARC",
 
-      # crbug.com/1054340
-      "crostini.AudioSanity.artifact",
-      "crostini.CopyPaste.wayland_to_wayland_artifact",
-      "crostini.CopyPaste.wayland_to_x11_artifact",
-      "crostini.DisplayDensity.wayland_artifact",
-      "crostini.DisplayDensity.x11_artifact",
-      "crostini.GPUEnabled.artifact_gpu",
-      "crostini.GPUEnabled.artifact_sw",
-      "crostini.LaunchTerminal.artifact",
-      "crostini.PackageInfo.artifact",
-      "crostini.PackageInstallUninstall.artifact",
-      "crostini.Restart.artifact",
-      "crostini.SecureCopyPaste.copy_wayland_artifact",
-      "crostini.SecureCopyPaste.copy_x11_artifact",
-      "crostini.SecureCopyPaste.paste_wayland_artifact",
-      "crostini.SecureCopyPaste.paste_x11_artifact",
-      "crostini.Toolkit.gtk3_wayland",
-      "crostini.Toolkit.gtk3_x11",
-      "crostini.Toolkit.qt5",
-      "crostini.Toolkit.tkinter",
-      "crostini.UninstallInvalidApp.artifact",
-      "crostini.VerifyAppWayland.artifact",
-      "crostini.VerifyAppX11.artifact",
-      "crostini.Webserver.artifact",
-
       # crbug.com/1056163
       "hwsec.LoginGuest",
     ]