Fix a security issue in app widget service. Bug: 234013191 Test: atest RemoteViewsAdapterTest Change-Id: Icd2eccb7a90124aca18a3dd463c3f79e3a595c20 Merged-In: Icd2eccb7a90124aca18a3dd463c3f79e3a595c20 (cherry picked from commit 263d7d0ba8818c471a27938c4e002bae33569f01)