Address warnings by -Weffc++

...ve/jni/com_android_inputmethod_latin_BinaryDictionary.cpp

native/jni/src/correction.cpp

native/jni/src/correction.h

native/jni/src/dictionary.cpp

native/jni/src/gesture/gesture_decoder_wrapper.h

native/jni/src/gesture/incremental_decoder_wrapper.h

native/jni/src/proximity_info.cpp

native/jni/src/proximity_info.h

native/jni/src/proximity_info_state.h

native/jni/src/terminal_attributes.h

native/jni/src/words_priority_queue.h

native/jni/src/words_priority_queue_pool.h