Polymer: get rid of count in `clear completed` button

examples/polymer/elements/td-todos.html

@@ -35,7 +35,7 @@
 						<a href="../#/completed">Completed</a>
 					</li>
 				</core-selector>
-				<button hidden?="{{model.completedCount == 0}}" id="clear-completed" on-click="{{clearCompletedAction}}">Clear completed ({{model.completedCount}})</button>
+				<button hidden?="{{model.completedCount == 0}}" id="clear-completed" on-click="{{clearCompletedAction}}">Clear completed</button>
 			</footer>
 		</section>
 	</template>