Transition the Normalizer class to call ICU4j.

The following benchmarks were obtained by running parts of NormalizerTest
through caliper.
            benchmark    us linear runtime
    ICU4cIsNormalized  5.09 ======
    ICU4jIsNormalized  5.22 ======
       ICU4cNormalize 22.56 ==============================
       ICU4jNormalize 21.97 =============================

NormalizerTest still passes after this change on Shamu. This change also
removes the JNI calls and their associated C++ wrappers.

Change-Id: I9081c899a76fdb3a341ca5ecd54c32cd6e6a0387
5 files changed