Perf: Fix RemoteViews memory leak

Fixes an issue where the context wrapper created in
RemoteViews leaks the RemoteViews instance through the
implicit this pointer of anonymous inner classes.

Fixed by replacing with a static inner class.

Bug: 37630958
Test: m droid (this change is not testable)
Change-Id: Ia149b3d91f134f0c308200b46880e7f87542a338