Disabled flaky TabStripTabList test.

TBR=johntlee@chromium.org

Bug: 1022008
Change-Id: Ie96a0a460ee38032568e978e7583711fcaa6d827
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1901589Reviewed-by: Joshua Pawlicki <waffles@chromium.org>
Reviewed-by: John Lee <johntlee@chromium.org>
Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/master@{#713105}

chrome/test/data/webui/tab_strip/tab_strip_browsertest.js

@@ -36,7 +36,8 @@ var TabStripTabListTest = class extends TabStripBrowserTest {
   }
 };
 
-TEST_F('TabStripTabListTest', 'All', function() {
+// Flaky on debug builds - crbug.com/1022008
+TEST_F('TabStripTabListTest', 'DISABLED_All', function() {
   mocha.run();
 });