Fix DownloadNotificationService foreground state

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

Index: chrome/android/javatests/src/org/chromium/chrome/browser/download/MockDownloadNotificationService.java
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/download/MockDownloadNotificationService.java b/chrome/android/javatests/src/org/chromium/chrome/browser/download/MockDownloadNotificationService.java
index 28284a5aa6b6e7661f0ab8107d3560330dcc747c..b57ae120e3bab0938692e86c330b91ce52088228 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/download/MockDownloadNotificationService.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/download/MockDownloadNotificationService.java
@@ -39,6 +39,20 @@ public class MockDownloadNotificationService extends DownloadNotificationService
     }
 
     @Override
+    boolean hasDownloadNotifications(Integer notificationIdToIgnore) {
+        // Cancelling notifications here is synchronous, so we don't really have to worry about
+        // {@code notificationIdToIgnore}, but address it properly anyway.
+        if (mNotificationIds.size() == 1 && notificationIdToIgnore != null) {
+            return !mNotificationIds.contains(notificationIdToIgnore);
+        }
+
+        return !mNotificationIds.isEmpty();
+    }
+
+    @Override
+    void cancelSummaryNotification() {}
+
+    @Override
     void updateNotification(int id, Notification notification) {
         if (!mNotificationIds.contains(id)) {
             mNotificationIds.add(id);