mac: History swiping doesn't work right with iframes.

content/browser/renderer_host/render_widget_host_impl.cc

Index: content/browser/renderer_host/render_widget_host_impl.cc
diff --git a/content/browser/renderer_host/render_widget_host_impl.cc b/content/browser/renderer_host/render_widget_host_impl.cc
index 5afb35d3ee61214ba6724785ebde7a2d0158b34e..9b0659ebed30fe9c871d9e7ff355281f71567199 100644
--- a/content/browser/renderer_host/render_widget_host_impl.cc
+++ b/content/browser/renderer_host/render_widget_host_impl.cc
@@ -1869,10 +1869,11 @@ void RenderWidgetHostImpl::OnWheelEventAck(
         ui::INPUT_EVENT_LATENCY_TERMINATED_MOUSE_COMPONENT, 0, 0);
   }
 
-  const bool processed = (INPUT_EVENT_ACK_STATE_CONSUMED == ack_result);
-  if (!processed && !is_hidden() && view_) {
-    if (!delegate_->HandleWheelEvent(wheel_event.event))
-      view_->UnhandledWheelEvent(wheel_event.event);
+  bool consumed = (INPUT_EVENT_ACK_STATE_CONSUMED == ack_result);
+  if (!is_hidden() && view_) {
+    if (!consumed)
+      consumed = delegate_->HandleWheelEvent(wheel_event.event);
+    view_->ProcessedWheelEvent(wheel_event.event, consumed);
   }
 }