Remove unnecessary classes from CorePlatformApi

This change removes TimeZoneNames, an associated
inner class and BasicLruCache from the
CorePlatformApi.

Classes with no methods are generally not useful
and these were included to keep some robolectric
test code compiling. The test code has now been
removed.

Bug: 113148576
Test: build only
Change-Id: If92a86ef1779905853a058a220610b5947aa55e1
3 files changed