Hide supervised user creation from UserManager when force sign in is enabled.

chrome/browser/resources/md_user_manager/create_profile.js

Index: chrome/browser/resources/md_user_manager/create_profile.js
diff --git a/chrome/browser/resources/md_user_manager/create_profile.js b/chrome/browser/resources/md_user_manager/create_profile.js
index ea4c28f2f0029e5c1e77c32719894c46b979c098..3e92efa3b2e54d205a7b77e3d330edabcce9a3d7 100644
--- a/chrome/browser/resources/md_user_manager/create_profile.js
+++ b/chrome/browser/resources/md_user_manager/create_profile.js
@@ -138,6 +138,17 @@ Polymer({
         return loadTimeData.getBoolean('profileShortcutsEnabled');
       },
       readOnly: true
+    },
+
+    /**
+     * True if the force sign in policy is enabled.
+     * @private {boolean}
+     */
+    isForceSigninEnabled_: {
+      type: Boolean,
+      value: function() {
+        return loadTimeData.getBoolean('isForceSigninEnabled');
+      },
     }
   },