[Sheriff] Disable WebAppTabStripBrowserTest.CustomTabBarUpdateOnTabSwitch

This test appears flaky. See the issue for details.

TBR=alancutter@chromium.org

Bug: 1113951
Change-Id: I1fd43393848727c9144cc28948084dc425d85dd5
No-Presubmit: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2341669Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795744}

chrome/browser/ui/views/web_apps/web_app_tab_strip_browsertest.cc

@@ -40,8 +40,9 @@ class WebAppTabStripBrowserTest : public InProcessBrowserTest {
   base::test::ScopedFeatureList features_;
 };
 
+// Disabled due to flake. https://crbug.com/1113951
 IN_PROC_BROWSER_TEST_F(WebAppTabStripBrowserTest,
-                       CustomTabBarUpdateOnTabSwitch) {
+                       DISABLED_CustomTabBarUpdateOnTabSwitch) {
   Profile* profile = browser()->profile();
 
   ASSERT_TRUE(embedded_test_server()->Start());