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

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

Change-Id: I26bf713a54f9428338fac33209962db092ffbd80