touch: Allow grabbing/ungrabbing touch devices for XInput2.

chrome/browser/renderer_host/render_widget_host_view_views.cc

Index: chrome/browser/renderer_host/render_widget_host_view_views.cc
diff --git a/chrome/browser/renderer_host/render_widget_host_view_views.cc b/chrome/browser/renderer_host/render_widget_host_view_views.cc
index 80804ad5b531c015aeb45955a65dcc86cdb923bc..806bc43d0c40a7f732b6b09c80fb51b85a13cc0d 100644
--- a/chrome/browser/renderer_host/render_widget_host_view_views.cc
+++ b/chrome/browser/renderer_host/render_widget_host_view_views.cc
@@ -696,7 +696,7 @@ views::View::TouchStatus RenderWidgetHostViewViews::OnTouchEvent(
       // _PRESSED event. So find that.
       // At the moment, only a maximum of 4 touch-points are allowed. So a
       // simple loop should be sufficient.
-      for (int i = 0; i < WebTouchEvent::touchPointsLengthCap; ++i) {
+      for (int i = 0; i < touch_event_.touchPointsLength; ++i) {
         point = touch_event_.touchPoints + i;
         if (point->id == e.identity()) {
           break;