Mark testRedirectChromeTabbedActivityToFirstRun as flaky

TBR=yusufo@chromium.org
NOTRY=true
NOTREECHECKS=true

Bug: 907548
Change-Id: Iff9b41e03778f21a0a81584b70d55fdfdeb9fdd8
Reviewed-on: https://chromium-review.googlesource.com/c/1346952Reviewed-by: Egor Pasko <pasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#610109}

chrome/android/javatests/src/org/chromium/chrome/browser/firstrun/FirstRunIntegrationTest.java

@@ -26,6 +26,7 @@ import org.junit.runner.RunWith;
 
 import org.chromium.base.ThreadUtils;
 import org.chromium.base.test.util.DisabledTest;
+import org.chromium.base.test.util.FlakyTest;
 import org.chromium.chrome.R;
 import org.chromium.chrome.browser.ChromeTabbedActivity;
 import org.chromium.chrome.browser.customtabs.CustomTabActivity;
@@ -93,6 +94,7 @@ public class FirstRunIntegrationTest {
 
     @Test
     @SmallTest
+    @FlakyTest(message = "crbug.com/907548")
     public void testRedirectChromeTabbedActivityToFirstRun() {
         final String asyncClassName = ChromeTabbedActivity.class.getName();
         runFirstRunRedirectTestForActivity(asyncClassName, () -> {