Disable flaky MediaRouterTest

This CL disables the following flaky test:

* org.chromium.weblayer.test.MediaRouterTest#testFailStartCancelled

Because it's flaky on builder:

* android-pie-x86-rel

TBR=estade@chromium.org

Bug: 1144233
Change-Id: Ic5cb140064e4dc5c31798e93dc9e1d762cf18267
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2510709Reviewed-by: Salvador Guerrero <salg@google.com>
Commit-Queue: Salvador Guerrero <salg@google.com>
Cr-Commit-Position: refs/heads/master@{#822748}

weblayer/browser/android/javatests/src/org/chromium/weblayer/test/MediaRouterTest.java

@@ -20,6 +20,7 @@ import org.junit.Test;
 import org.junit.runner.RunWith;
 
 import org.chromium.base.test.util.CommandLineFlags;
+import org.chromium.base.test.util.DisabledTest;
 import org.chromium.base.test.util.Feature;
 import org.chromium.base.test.util.Restriction;
 import org.chromium.content_public.browser.test.util.ClickUtils;
@@ -248,6 +249,7 @@ public class MediaRouterTest {
     @Test
     @Restriction({UiRestriction.RESTRICTION_TYPE_PHONE, RESTRICTION_TYPE_NON_LOW_END_DEVICE})
     @Feature({"MediaRouter"})
+    @DisabledTest(message = "https://crbug.com/1144233")
     @LargeTest
     public void testFailStartCancelled() throws Exception {
         getTestWebLayer().initializeMockMediaRouteProvider(/*closeRouteWithErrorOnSend=*/false,