Move libcore/include to point of use

Move the ScopedIcuLocale.h and ScopedJavaUnicodeString.h
to the places they are used. Remove the pretence that libcore/
is in the business of providing native utility code and this
should make that more obvious.

Test: Build
Bug: 111055375
Change-Id: I5113a2a5275cf4e1dcc52782bc957986af35f9c3
3 files changed