Change to a binary version of the expandable user dictionary.

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

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

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

...od/latin/SynchronouslyLoadedContactsBinaryDictionary.java

...method/latin/SynchronouslyLoadedUserBinaryDictionary.java

.../inputmethod/latin/SynchronouslyLoadedUserDictionary.java

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

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

...utmethod/latin/spellcheck/AndroidSpellCheckerService.java