Start download manager as new task

This fixes the issue where download activity is shown as part of
browser activity task stack when browser is re-launched.

Change-Id: I3299f40ab1bcb965054c13031229a30ef7068a4f
diff --git a/src/com/android/browser/DownloadHandler.java b/src/com/android/browser/DownloadHandler.java
index 556b39f..0148fda 100644
--- a/src/com/android/browser/DownloadHandler.java
+++ b/src/com/android/browser/DownloadHandler.java
@@ -468,6 +468,7 @@
             boolean privateBrowsing) {
         if (!privateBrowsing) {
             Intent intent = new Intent(DownloadManager.ACTION_VIEW_DOWNLOADS);
+            intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
             activity.startActivity(intent);
         } else {
             activity.finish();