Clean up some compiler warnings

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

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

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

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

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

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

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

...oid/inputmethod/latin/makedict/BinaryDictInputOutput.java

.../android/inputmethod/latin/makedict/FusionDictionary.java

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