Disable 4 autofill tests that are still flaky

4 tests that I thought I fixed are still failing on the bot, so
disabling for now while I investigate further.

Autofill tests disabled: academy, dell, findmeagift, timberland

Bug: 984664
Change-Id: I6af57bf572d244251bff22c7210dd4e2b5510768
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1763240
Auto-Submit: Ian Struiksma <ianstruiksma@google.com>
Commit-Queue: Caleb Rouleau <crouleau@chromium.org>
Reviewed-by: Caleb Rouleau <crouleau@chromium.org>
Cr-Commit-Position: refs/heads/master@{#689539}

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

@@ -98,7 +98,7 @@
     { "site_name": "therealreal" },
     { "site_name": "threadless" },
     { "site_name": "tickets" },
-    { "site_name": "timberland" },
+    { "site_name": "timberland", "disabled":true, "bug_number":993044 },
     { "site_name": "torrid" },
     { "site_name": "tradepub" },
     { "site_name": "uhaul" },
@@ -121,7 +121,7 @@
     { "site_name": "cdbaby", "expectation":"PASS" },
     { "site_name": "coach", "expectation":"FAIL", "bug_number":996478 },
     { "site_name": "customink", "expectation":"PASS" },
-    { "site_name": "dell", "expectation":"PASS" },
+    { "site_name": "dell", "expectation":"PASS", "disabled":true, "bug_number":993044 },
     { "site_name": "fromyouflowers", "expectation":"PASS" },
     { "site_name": "hobbylobby", "expectation":"PASS" },
     { "site_name": "jostens", "expectation":"PASS" },
@@ -135,12 +135,12 @@
     { "site_name": "walmart", "expectation":"PASS" },
     { "site_name": "horizoncardservices", "expectation":"PASS" },
     { "site_name": "netfirstplatinum", "expectation":"PASS" },
-    { "site_name": "academy", "expectation":"PASS" },
+    { "site_name": "academy", "expectation":"FAIL", "bug_number":996478 },
     { "site_name": "bradfordexchange", "expectation":"PASS" },
     { "site_name": "dicks_sporting_goods", "expectation":"PASS" },
     { "site_name": "duluthtrading", "expectation":"FAIL", "bug_number":996478 },
     { "site_name": "fansedge", "expectation":"PASS" },
-    { "site_name": "findmeagift", "expectation":"PASS" },
+    { "site_name": "findmeagift", "expectation":"PASS", "disabled":true, "bug_number":993044 },
     { "site_name": "groupon", "expectation":"PASS" },
     { "site_name": "kohls", "expectation":"PASS" },
     { "site_name": "living_social", "expectation":"PASS" },