sheriff: Disable QualityEnforcerTest#notifiedWhenLaunch404

Reason: flaky on a few bots since around 2020-11-02.

Tbr: eirage@chromium.org
Bug: 1145181
Change-Id: I9d2cf14a4f1ca26127822f3974626e2142a5ae3a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517720Reviewed-by: Egor Pasko <pasko@chromium.org>
Commit-Queue: Egor Pasko <pasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#823621}

chrome/android/javatests/src/org/chromium/chrome/browser/browserservices/QualityEnforcerTest.java

@@ -96,6 +96,7 @@ public class QualityEnforcerTest {
 
     @Test
     @MediumTest
+    @DisabledTest(message = "https://crbug.com/1145181")
     public void notifiedWhenLaunch404() throws TimeoutException {
         launch(mTestPage404);
         mCallbackHelper.waitForFirst();