[sheriff] Disable flaky test.

Disables LookalikeUrlNavigationThrottleBrowserTest.Idn_SiteEngagement_Match
which flakes on all platforms.

TBR=jdeblasio@chromium.org

Bug: 1106402
Change-Id: I4c31fbbaa67f9e6cac7b4faa1a17f1ddc3d774cc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2311073Reviewed-by: Katie Dektar <katie@chromium.org>
Commit-Queue: Katie Dektar <katie@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791033}

chrome/browser/lookalikes/lookalike_url_navigation_throttle_browsertest.cc

@@ -763,8 +763,9 @@ IN_PROC_BROWSER_TEST_P(LookalikeUrlNavigationThrottleBrowserTest,
 // site engagement score above a certain threshold. This should record metrics.
 // It should also show lookalike warning interstitial if configured via
 // a feature param.
+// Disabled for flakes, crbug.com/1106402.
 IN_PROC_BROWSER_TEST_P(LookalikeUrlNavigationThrottleBrowserTest,
-                       Idn_SiteEngagement_Match) {
+                       DISABLED_Idn_SiteEngagement_Match) {
   const char* const kEngagedSites[] = {
       "http://site1.com", "http://www.site2.com", "http://sité3.com",
       "http://www.sité4.com"};