Use BinaryDictionaryUtils to read dictionary header.

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

...com/android/inputmethod/latin/BinaryDictionaryGetter.java

...android/inputmethod/latin/makedict/BinaryDictIOUtils.java

...rc/com/android/inputmethod/latin/makedict/FormatSpec.java

...m/android/inputmethod/latin/makedict/Ver2DictDecoder.java

...ndroid/inputmethod/latin/utils/BinaryDictionaryUtils.java

.../android/inputmethod/latin/utils/DictionaryInfoUtils.java