Prepare ExpandableBinaryDictionary to make it updatable

...m/android/inputmethod/latin/AbstractDictionaryWriter.java

...m/android/inputmethod/latin/ContactsBinaryDictionary.java

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

...android/inputmethod/latin/ExpandableBinaryDictionary.java

...c/com/android/inputmethod/latin/UserBinaryDictionary.java

...thod/latin/personalization/PersonalizationDictionary.java