Remove MAX_PROXIMITY_CHARS_SIZE_INTERNAL

java/src/com/android/inputmethod/keyboard/ProximityInfo.java

java/src/com/android/inputmethod/latin/BinaryDictionary.java

java/src/com/android/inputmethod/latin/Constants.java

...ve/jni/com_android_inputmethod_keyboard_ProximityInfo.cpp

native/jni/src/defines.h

native/jni/src/proximity_info.cpp

native/jni/src/proximity_info.h

native/jni/src/proximity_info_state.cpp

native/jni/src/proximity_info_state.h

native/jni/src/proximity_info_state_utils.cpp

native/jni/src/proximity_info_state_utils.h

native/jni/src/proximity_info_utils.h