Remove unused methods from AssetManager.cpp

A lot of the vendor/locale specific code existed pre-1.0
and was reworked into the current system.

Test: refactoring CL, all code except setLocale() was not being executed.
Test: setLocale() change tested manually
Change-Id: Ifb098f9808763a6cf5fb4336e089430adc09e198
3 files changed