Cleanup headers

...ve/jni/com_android_inputmethod_keyboard_ProximityInfo.cpp

...ve/jni/com_android_inputmethod_latin_BinaryDictionary.cpp

native/jni/com_android_inputmethod_latin_NativeUtils.cpp

native/jni/jni_common.cpp

native/jni/jni_common.h

native/jni/src/bigram_dictionary.cpp

native/jni/src/bigram_dictionary.h

native/jni/src/char_utils.cpp

native/jni/src/correction.cpp

native/jni/src/correction.h

native/jni/src/dictionary.cpp

native/jni/src/proximity_info.cpp

native/jni/src/proximity_info_state.cpp

native/jni/src/proximity_info_state.h

native/jni/src/unigram_dictionary.cpp

native/jni/src/unigram_dictionary.h

native/jni/src/words_priority_queue.h

native/jni/src/words_priority_queue_pool.h