[sheriff] Disable flaky PrerenderTest.AliasURLTest

TBR=robertogden@chromium.org

Bug: 1105908
Change-Id: Iaa8be308734a24879c43687c197f600d64a062ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2341814Reviewed-by: Natalie Chouinard <chouinard@chromium.org>
Reviewed-by: Robert Ogden <robertogden@chromium.org>
Commit-Queue: Natalie Chouinard <chouinard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795657}

chrome/browser/prerender/prerender_unittest.cc

@@ -997,7 +997,8 @@ TEST_F(PrerenderTest, MaxConcurrencyTest) {
   }
 }
 
-TEST_F(PrerenderTest, AliasURLTest) {
+// Flaky on Android: https://crbug.com/1105908
+TEST_F(PrerenderTest, DISABLED_AliasURLTest) {
   ASSERT_TRUE(IsNoStatePrefetchEnabled());
   SetConcurrency(7);