Link to example of failing run
https://build.chromium.org/p/chromium.android.fyi/builders/Nougat%20Phone%20Tester/builds/3990

link to failure output
https://luci-logdog.appspot.com/v/?s=chromium%2Fbb%2Fchromium.android.fyi%2FNougat_Phone_Tester%2F3989%2F%2B%2Frecipes%2Fsteps%2Fchrome_public_test_apk_on_Android%2F0%2Flogs%2Forg.chromium.chrome.browser.download.DownloadNotificationServiceTest_testAddingAndCancelingNotifications%2F0


Actual failure output:

java.lang.AssertionError: expected null, but was:<[6,1,LEGACY_DOWNLOAD,f3f81491-788e-4040-a52c-2b881c24001b,0,1,1,0,test1]>
	at org.junit.Assert.fail(Assert.java:88)
	at org.junit.Assert.failNotNull(Assert.java:755)
	at org.junit.Assert.assertNull(Assert.java:737)
	at org.junit.Assert.assertNull(Assert.java:747)
	at org.chromium.chrome.browser.download.DownloadNotificationServiceTest.setUp(DownloadNotificationServiceTest.java:114)
	at org.chromium.base.test.BaseTestResult.run(BaseTestResult.java:110)
	at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:198)
	at android.test.AndroidTestRunner.runTest(AndroidTestRunner.java:183)
	at android.test.InstrumentationTestRunner.onStart(InstrumentationTestRunner.java:560)
	at android.app.Instrumentation$InstrumentationThread.run(Instrumentation.java:1932)


cc'ing Yoland who added the failing assert in https://chromium-review.googlesource.com/c/chromium/src/+/708042