To switch another user to do something should create the context of the
specified user by using Context.createContextAsUser rather than call
*AsUser API directly.
To change Icon not to use PackageManager.getResourcesForApplicationAsUser
lets StatusBarIconViewTest no need to mock
getResourcesForApplicationAsUser in mock PackageManager instance.
Test: make -j droid cts gts vts
Test: make -j docs
Test: atest SystemUITests \
FrameworksServicesTests:com.android.server.pm \
CtsGraphicsTestCases:android.graphics.drawable.cts.IconTest \
FrameworksCoreTests:android.graphics.drawable.IconTest
Bug: 170928809
Change-Id: I4a2ec54b6e137a9c9efcfba0589c08ea8cac86ce
f922ae3179