[Sheriff] Disable MapsGoFirstRunTest#testFirstRunIsShown as flaky

TBR=aluo@chromium.org

Bug: 1142821
Change-Id: I24d4c52296abd4aa9b148ca4ef6ca9f6f32b4ba0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2521100Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Commit-Queue: Stephen McGruer <smcgruer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825341}

chrome/test/android/BUILD.gn

@@ -131,6 +131,7 @@ instrumentation_test_apk("chrome_java_test_webapk_launch_tests") {
   deps = [
     ":chrome_java_test_pagecontroller",
     "//base:base_java",
+    "//base:base_java_test_support",
     "//chrome/android:chrome_java",
     "//chrome/android/webapk/libs/client:client_java",
     "//components/webapk/android/libs/client:java",

chrome/test/android/javatests/src/org/chromium/chrome/test/pagecontroller/tests/webapk/MapsGoFirstRunTest.java

@@ -20,6 +20,7 @@ import org.junit.runner.RunWith;
 
 import org.chromium.base.Log;
 import org.chromium.base.test.BaseJUnit4ClassRunner;
+import org.chromium.base.test.util.DisabledTest;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.firstrun.FirstRunStatus;
 import org.chromium.chrome.browser.webapps.WebappRegistry;
@@ -54,6 +55,7 @@ public class MapsGoFirstRunTest {
     }
 
     @Test
+    @DisabledTest(message = "https://crbug.com/1142821")
     public void testFirstRunIsShown() {
         FirstRunStatus.setLightweightFirstRunFlowComplete(false);
         launchWebapk("org.chromium.test.maps_go_webapk", "org.chromium.chrome");