Revert of Re-target wheel events only when a new scroll sequence has started.

content/browser/renderer_host/render_widget_host_input_event_router.cc

Index: content/browser/renderer_host/render_widget_host_input_event_router.cc
diff --git a/content/browser/renderer_host/render_widget_host_input_event_router.cc b/content/browser/renderer_host/render_widget_host_input_event_router.cc
index c88f7d63470077bf2808037a847c69179c78be73..fe73293b46648e74e62ba09a7c44d459d65bf308 100644
--- a/content/browser/renderer_host/render_widget_host_input_event_router.cc
+++ b/content/browser/renderer_host/render_widget_host_input_event_router.cc
@@ -284,27 +284,7 @@
                        event->PositionInWidget().y),
             target, &transformed_point))
       return;
-  } else if (root_view->wheel_scroll_latching_enabled()) {
-    if (event->phase == blink::WebMouseWheelEvent::kPhaseBegan) {
-      wheel_target_.target = FindEventTarget(
-          root_view,
-          gfx::Point(event->PositionInWidget().x, event->PositionInWidget().y),
-          &transformed_point);
-      wheel_target_.delta =
-          transformed_point -
-          gfx::Point(event->PositionInWidget().x, event->PositionInWidget().y);
-      target = wheel_target_.target;
-    } else {
-      if (wheel_target_.target) {
-        target = wheel_target_.target;
-        transformed_point = gfx::Point(event->PositionInWidget().x,
-                                       event->PositionInWidget().y) +
-                            wheel_target_.delta;
-      }
-    }
-
-  } else {  // !root_view->IsMouseLocked() &&
-            // !root_view->wheel_scroll_latching_enabled()
+  } else {
     target = FindEventTarget(
         root_view,
         gfx::Point(event->PositionInWidget().x, event->PositionInWidget().y),
@@ -316,12 +296,6 @@
 
   event->SetPositionInWidget(transformed_point.x(), transformed_point.y());
   target->ProcessMouseWheelEvent(*event, latency);
-
-  DCHECK(root_view->wheel_scroll_latching_enabled() || !wheel_target_.target);
-  if (event->phase == blink::WebMouseWheelEvent::kPhaseEnded ||
-      event->momentum_phase == blink::WebMouseWheelEvent::kPhaseEnded) {
-    wheel_target_.target = nullptr;
-  }
 }
 
 void RenderWidgetHostInputEventRouter::RouteGestureEvent(