Disable inputs.VirtualKeyboardOOBE from chrome_all_tast_tests

This test is failing due to the same reason we discussed at
crbug.com/1115622, test scenario fails to load important data
because the test running environment is missing the data files.

Until resolved, this test should be disabled here, otherwise
further ChromeOS LKGM update will be blocked.

Bug: 1115622
Test: none
Change-Id: I56ea90e2cb39ccc164145ac108bbcddebbbce2b9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2360271Reviewed-by: Ben Pastene <bpastene@chromium.org>
Reviewed-by: Achuith Bhandarkar <achuith@chromium.org>
Commit-Queue: Jun Mukai <mukai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798693}

chromeos/BUILD.gn

@@ -289,6 +289,7 @@ if (is_chromeos_device) {
     tast_disabled_tests = [
       # crbug.com/1115622
       "ui.ChromeLoginGAIA",
+      "inputs.VirtualKeyboardOOBE",
 
       # crbug.com/1097630
       "security.OpenFDs",