message: fix processGesture arguments error
diff: @@ -112,7 +112,7 @@ var domHandlers = {
  this._lastTouchMoment = new Date();
  - this.handler.processGesture(this, event, 'start');
  + this.handler.processGesture(event, 'start');
  // In touch device, trigger `mousemove`(`mouseover`) should
  // be triggered, and must before `mousedown` triggered.
  @@ -136,7 +136,7 @@ var domHandlers = {
  // mouse event in upper applicatoin.
  event.zrByTouch = true;
  - this.handler.processGesture(this, event, 'change');
  + this.handler.processGesture(event, 'change');
  // Mouse move should always be triggered no matter whether
  // there is gestrue event, because mouse move and pinch may
  @@ -159,7 +159,7 @@ var domHandlers = {
  // mouse event in upper applicatoin.
  event.zrByTouch = true;
  - this.handler.processGesture(this, event, 'end');
  + this.handler.processGesture(event, 'end');
  domHandlers.mouseup.call(this, event);
  