login: Restrict lock screen apps to eve

TEST=lock screen note taking works on eve
BUG=chromium:767698

Change-Id: Ifae00658ac9bd9f85a8108724052ef23e0f4d980
Reviewed-on: https://chromium-review.googlesource.com/682397
Commit-Ready: Toni Barzic <tbarzic@chromium.org>
Tested-by: Toni Barzic <tbarzic@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/690774
Reviewed-by: Toni Barzic <tbarzic@chromium.org>
Commit-Queue: Toni Barzic <tbarzic@chromium.org>
diff --git a/login_manager/chrome_setup.cc b/login_manager/chrome_setup.cc
index e6b8e73..f421b76 100644
--- a/login_manager/chrome_setup.cc
+++ b/login_manager/chrome_setup.cc
@@ -328,6 +328,9 @@
   if (builder->UseFlagIsSet("eve")) {
     builder->AddArg("--force-clamshell-power-button");
     builder->AddArg("--enable-instant-tethering");
+  } else {
+    // TODO(tbarzic): Remove in M63: https://crbug.com/767698
+    builder->AddArg("--disable-lock-screen-apps");
   }
 
   if (builder->UseFlagIsSet("kevin")) {