Disable capture_update_pass/southwest automated test

This test is failing on the linux bot consistently.
Disabling it for now as we investigate.

More details in the bug description.

Bug: 1014333
Change-Id: I0efb42942e05606a35df73a0e4a2b508c0cc4cf4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1861020Reviewed-by: Dominic Battré <battre@chromium.org>
Commit-Queue: Dominic Battré <battre@chromium.org>
Auto-Submit: Ian Struiksma <ianstruiksma@google.com>
Cr-Commit-Position: refs/heads/master@{#705936}

chrome/test/data/password/captured_sites/testcases.json

@@ -17,7 +17,7 @@
     { "scenario_dir":"capture_update_pass", "site_name":"rakuten" },
     { "scenario_dir":"capture_update_pass", "site_name":"readtheory" },
     { "scenario_dir":"capture_update_pass", "site_name":"roblox" },
-    { "scenario_dir":"capture_update_pass", "site_name":"southwest" },
+    { "scenario_dir":"capture_update_pass", "site_name":"southwest", "disabled":true, "bug_number":1014333 },
     { "scenario_dir":"capture_update_pass", "site_name":"steam" },
     { "scenario_dir":"capture_update_pass", "site_name":"the_sims_resource" },
     { "scenario_dir":"capture_update_pass", "site_name":"united" },