Merge pull request #1782 from Hixie/gesture-fixes

trivial cleanup in gesture code

packages/flutter/lib/src/gestures/scale.dart

@@ -133,8 +133,4 @@ class ScaleGestureRecognizer extends GestureRecognizer {
     }
     _state = ScaleState.ready;
   }
-
-  void dispose() {
-    super.dispose();
-  }
 }

packages/flutter/lib/src/gestures/tap.dart

@@ -77,7 +77,7 @@ class TapGesture extends TapTracker {
     entry = GestureArena.instance.add(event.pointer, gestureRecognizer);
     _wonArena = false;
     _didTap = false;
-    startTimer(() => cancel());
+    startTimer(cancel);
     startTrackingPointer(gestureRecognizer.router, handleEvent);
   }