Remove unused phrase gesture code.

...ndroid/inputmethod/latin/common/NativeSuggestOptions.java

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

.../com/android/inputmethod/latin/inputlogic/InputLogic.java

.../src/com/android/inputmethod/latin/settings/Settings.java

...om/android/inputmethod/latin/settings/SettingsValues.java

...putmethod/latin/settings/SettingsValuesForSuggestion.java

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