Secure the pendingIntent in SearchWidgetProvider. am: ae2c873754 am: a51a669fe6 am: 1367aef11c am: 78a2c7633d am: e0fcc36980 am: 11b29ba771 am: f8c478e0a5

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

Change-Id: I6332dd165c7d31a8f30be3a99825fd1d17b7f2bd