Sheriff: Disable Failing SelectToSpeakNavigationControlTest.ChangeSpeedWhilePlaying Test

SelectToSpeakNavigationControlTest.ChangeSpeedWhilePlaying is consistently
failing.

More details:
https://ci.chromium.org/ui/p/chromium/builders/ci/linux-chromeos-rel/b8861209763102157072/overview

This test is failing on Chromeos-rel, Chromeos-dbg,
linux-chromeos-chrome,Chromeos-ASan, MSan bots.

Suspected CL:
https://chromium-review.googlesource.com/c/chromium/src/+/2577882

TBR=joelriley@google.com,dmazzoni@chromium.org

Bug: 1157817
Change-Id: Id2b66c92cce7199046707b85738fc143da48436e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2586762Reviewed-by: Sreeja Kamishetty <sreejakshetty@chromium.org>
Commit-Queue: Sreeja Kamishetty <sreejakshetty@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836114}

chrome/browser/resources/chromeos/accessibility/select_to_speak/select_to_speak_navigation_control_test.js

@@ -304,8 +304,9 @@ TEST_F('SelectToSpeakNavigationControlTest', 'PrevSentence', function() {
       });
 });
 
+// TODO(https://crbug.com/1157817): Fix Flaky Test.
 TEST_F(
-    'SelectToSpeakNavigationControlTest', 'ChangeSpeedWhilePlaying',
+    'SelectToSpeakNavigationControlTest', 'DISABLED_ChangeSpeedWhilePlaying',
     function() {
       chrome.settingsPrivate.setPref('settings.tts.speech_rate', 1.2);
       const bodyHtml = `