Overhaul Mandoline event transport code

components/view_manager/display_manager.cc

Index: components/view_manager/display_manager.cc
diff --git a/components/view_manager/display_manager.cc b/components/view_manager/display_manager.cc
index 7994dc00dc9a80eb15f5e2b379509e8216e84069..b18587c03c4bec3fec455fe5f7636bd01bf4e74f 100644
--- a/components/view_manager/display_manager.cc
+++ b/components/view_manager/display_manager.cc
@@ -87,15 +87,6 @@ void DrawViewTree(cc::RenderPass* pass,
                        view->surface_id());
 }
 
-float ConvertUIWheelValueToMojoValue(int offset) {
-  // Mojo's event type takes a value between -1 and 1. Normalize by allowing
-  // up to 20 of ui's offset. This is a bit arbitrary.
-  return std::max(
-      -1.0f, std::min(1.0f, static_cast<float>(offset) /
-                                (20 * static_cast<float>(
-                                          ui::MouseWheelEvent::kWheelDelta))));
-}
-
 }  // namespace
 
 // static
@@ -259,17 +250,7 @@ void DefaultDisplayManager::OnDamageRect(const gfx::Rect& damaged_region) {
 
 void DefaultDisplayManager::DispatchEvent(ui::Event* event) {
   mojo::EventPtr mojo_event(mojo::Event::From(*event));
-  if (event->IsMouseWheelEvent()) {
-    // Mojo's event type has a different meaning for wheel events. Convert
-    // between the two.
-    ui::MouseWheelEvent* wheel_event =
-        static_cast<ui::MouseWheelEvent*>(event);
-    DCHECK(mojo_event->pointer_data);
-    mojo_event->pointer_data->horizontal_wheel =
-        ConvertUIWheelValueToMojoValue(wheel_event->x_offset());
-    mojo_event->pointer_data->horizontal_wheel =
-        ConvertUIWheelValueToMojoValue(wheel_event->y_offset());
-  }
+
   delegate_->OnEvent(mojo_event.Pass());
 
   switch (event->type()) {