[Sheriff] Disable WebIntegrationTest.PlayVideo

This newly added test is timing out.

TBR=sergeyu@chromium.org

Bug: 1090159
Change-Id: I5dcc92935e12664770a17ce9f70ec03c3c9710bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225595Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Cr-Commit-Position: refs/heads/master@{#773914}

fuchsia/engine/web_engine_integration_test.cc

@@ -524,7 +524,7 @@ TEST_F(WebEngineIntegrationTest, PlayAudio) {
   EXPECT_FALSE(fake_audio_consumer_service_->instance(0)->is_muted());
 }
 
-TEST_F(WebEngineIntegrationTest, PlayVideo) {
+TEST_F(WebEngineIntegrationTest, DISABLED_PlayVideo) {
   StartWebEngine();
   CreateContextAndFrame(ContextParamsWithAudioAndTestData());