libweave: Remove native_types namespace It has only two typedefs. Now they are ValueMap and ValueVector. BUG=brillo:1245 TEST='FEATURES=test emerge-gizmo buffet' Change-Id: Iefd3ee2bc18432450fd13876fadfe23bf62cb2dc Reviewed-on: https://chromium-review.googlesource.com/287167 Tested-by: Vitaly Buka <vitalybuka@chromium.org> Reviewed-by: Alex Vakulenko <avakulenko@chromium.org> Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>