Properly clean up notification on download open

chrome/android/javatests/src/org/chromium/chrome/browser/download/DownloadNotificationServiceTest.java

Index: chrome/android/javatests/src/org/chromium/chrome/browser/download/DownloadNotificationServiceTest.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/download/DownloadNotificationServiceTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/download/DownloadNotificationServiceTest.java
index 9923c951e7751e28ac1ce97b13d33c11dd4ebb8f..27f8ce82117c3ccc8029ce08245c0c6041a10482 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/download/DownloadNotificationServiceTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/download/DownloadNotificationServiceTest.java
@@ -308,6 +308,14 @@ public class DownloadNotificationServiceTest extends
         service.notifyDownloadCanceled(id3);
         assertEquals(2, getService().getNotificationIds().size());
         assertFalse(getService().getNotificationIds().contains(lastNotificationId));
+
+        ContentId id4 = LegacyHelpers.buildLegacyContentId(false, UUID.randomUUID().toString());
+        service.notifyDownloadSuccessful(id4, "/path/to/success", "success", 100L, false, false);
+        assertEquals(3, getService().getNotificationIds().size());
+        int nextNotificationId = getService().getLastAddedNotificationId();
+        service.cancelNotification(nextNotificationId, id4);
+        assertEquals(2, getService().getNotificationIds().size());
+        assertFalse(getService().getNotificationIds().contains(nextNotificationId));
     }
 
     /**