Remove dead code, including tests.

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

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

.../com/android/inputmethod/keyboard/KeyboardLayoutTest.java

.../com/android/inputmethod/latin/BinaryDictionaryTests.java

...tmethod/latin/makedict/BinaryDictDecoderEncoderTests.java

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

...roid/inputmethod/latin/makedict/Ver2DictEncoderTests.java

...m/android/inputmethod/latin/makedict/Ver4DictEncoder.java

...d/inputmethod/latin/utils/BinaryDictionaryUtilsTests.java