Removing Scroll user actions because they are extremely spammy.

content/browser/renderer_host/render_widget_host_view_event_handler.cc

Index: content/browser/renderer_host/render_widget_host_view_event_handler.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_event_handler.cc b/content/browser/renderer_host/render_widget_host_view_event_handler.cc
index 9d8bc9d6945d932c3336ec417b93ff215589201b..2307c54ea031f41d6084be4746e431d84f305814 100644
--- a/content/browser/renderer_host/render_widget_host_view_event_handler.cc
+++ b/content/browser/renderer_host/render_widget_host_view_event_handler.cc
@@ -413,7 +413,6 @@ void RenderWidgetHostViewEventHandler::OnScrollEvent(ui::ScrollEvent* event) {
       host_->ForwardWheelEventWithLatencyInfo(mouse_wheel_event,
                                               *event->latency());
     }
-    RecordAction(base::UserMetricsAction("TrackpadScroll"));
   } else if (event->type() == ui::ET_SCROLL_FLING_START ||
              event->type() == ui::ET_SCROLL_FLING_CANCEL) {
     blink::WebGestureEvent gesture_event = ui::MakeWebGestureEvent(
@@ -524,9 +523,7 @@ void RenderWidgetHostViewEventHandler::OnGestureEvent(ui::GestureEvent* event) {
       host_->ForwardGestureEventWithLatencyInfo(gesture, *event->latency());
     }
 
-    if (event->type() == ui::ET_GESTURE_SCROLL_BEGIN ||
-        event->type() == ui::ET_GESTURE_SCROLL_UPDATE ||
-        event->type() == ui::ET_GESTURE_SCROLL_END) {
+    if (event->type() == ui::ET_GESTURE_SCROLL_BEGIN) {
       RecordAction(base::UserMetricsAction("TouchscreenScroll"));
     } else if (event->type() == ui::ET_SCROLL_FLING_START) {
       RecordAction(base::UserMetricsAction("TouchscreenScrollFling"));