Remove redundant functions, bindings, props

src/components/views/rooms/MessageComposerInput.js

@@ -73,13 +73,6 @@ export default class MessageComposerInput extends React.Component {
         // called with current plaintext content (as a string) whenever it changes
         onContentChanged: React.PropTypes.func,
 
-        onUpArrow: React.PropTypes.func,
-
-        onDownArrow: React.PropTypes.func,
-
-        // attempts to confirm currently selected completion, returns whether actually confirmed
-        tryComplete: React.PropTypes.func,
-
         onInputStateChanged: React.PropTypes.func,
     };