Update ActivityIntentHelper to use PendingIntents directly am: 3ee3b7a20a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/19285839

Change-Id: Ie6ba6783663caa8efa6e740f1c0e49df54521627
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>