Cleanup unused variables and parameters

...android/inputmethod/accessibility/AccessibilityUtils.java

...thod/accessibility/AccessibleInputMethodServiceProxy.java

...nputmethod/accessibility/AccessibleKeyboardViewProxy.java

...droid/inputmethod/accessibility/FlickGestureDetector.java

...d/inputmethod/accessibility/KeyCodeDescriptionMapper.java

...c/com/android/inputmethod/keyboard/LatinKeyboardView.java

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

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

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

.../com/android/inputmethod/latin/UserUnigramDictionary.java