Always enable all SHELL tests on ChromeOS

As SHELL library is being used by AutoEnrollmentClientImpl*, its
tests should always be ran when the platform is ChromeOS.

BUG=chromium:1151230

Change-Id: I5adfaaa35ea0367b24cc339ba0981cc85b0b61eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2550808
Commit-Queue: Amr Aboelkher <[email protected]>
Reviewed-by: Dirk Pranke <[email protected]>
Reviewed-by: Ben Pastene <[email protected]>
Reviewed-by: Brian Sheedy <[email protected]>
Cr-Commit-Position: refs/heads/master@{#832448}
diff --git a/BUILD.gn b/BUILD.gn
index f93a89e0..9b56f2e 100644
--- a/BUILD.gn
+++ b/BUILD.gn
@@ -442,6 +442,7 @@
       "//chromeos/components/proximity_auth:proximity_auth_unittests",
       "//components/exo/wayland:wayland_client_compatibility_tests",
       "//components/session_manager/core",
+      "//third_party/shell-encryption:shell_encryption_unittests",
       "//ui/chromeos:ui_chromeos_unittests",
     ]
   }