Remove unnecessary @IntraCoreApi annotation

ctor Charset(String, String[]) has been in the public Android SDK.
@IntraCoreApi is not necessary, and in fact, the ojluni codes should
not be annotated directly.

The mistake was made in https://r.android.com/1151162

Test: m droid
Change-Id: I754235d476929b738380f222033800544f48d002
2 files changed