[Lookalikes] Speculatively re-enable Idn_SiteEngagement_Match

I can't get this test to timeout, so I'm re-enabling it on the offchance
that the issue was transient caused by something else.

Fixed: 1106402.
Change-Id: I5abe1b431772d19f2f6d47488347e938939452f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2360756
Auto-Submit: Joe DeBlasio <jdeblasio@chromium.org>
Commit-Queue: Mustafa Emre Acer <meacer@chromium.org>
Reviewed-by: Mustafa Emre Acer <meacer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798930}

chrome/browser/lookalikes/lookalike_url_navigation_throttle_browsertest.cc

@@ -763,9 +763,8 @@ 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,
-                       DISABLED_Idn_SiteEngagement_Match) {
+                       Idn_SiteEngagement_Match) {
   const char* const kEngagedSites[] = {
       "http://site1.com", "http://www.site2.com", "http://sité3.com",
       "http://www.sité4.com"};