deprecate notificationId for downloads

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 91a865de42dc79231791765152110117b28dee85..85ebe410f3fdbeec0a9ef20c187a2f2ba3566cf3 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
@@ -17,6 +17,7 @@ public class MockDownloadNotificationService extends DownloadNotificationService
     private final List<Integer> mNotificationIds = new ArrayList<Integer>();
     private boolean mPaused = false;
     private Context mContext;
+    private int mLastNotificationId;
 
     void setContext(Context context) {
         mContext = context;
@@ -32,6 +33,7 @@ public class MockDownloadNotificationService extends DownloadNotificationService
     void updateNotification(int id, Notification notification) {
         if (!mNotificationIds.contains(id)) {
             mNotificationIds.add(id);
+            mLastNotificationId = id;
         }
     }
 
@@ -48,6 +50,10 @@ public class MockDownloadNotificationService extends DownloadNotificationService
         mNotificationIds.remove(Integer.valueOf(notificationId));
     }
 
+    public int getLastAddedNotificationId() {
+        return mLastNotificationId;
+    }
+
     @Override
     public Context getApplicationContext() {
         return mContext == null ? super.getApplicationContext() : mContext;