Secure the pendingIntent in SearchWidgetProvider. am: ae2c873754 am: a51a669fe6 am: 1367aef11c am: 78a2c7633d am: 8d39e94f38 am: ace693ffea

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/QuickSearchBox/+/15806296

Change-Id: If339810991006a059fee43933c0d55a45e1c265f