Remove inappropriate early-out in OnWindowDisplayChanged

When moving between two screens that don't change scale factor, but do
change color space, this message was getting dropped.

Remove the early-out, because the call to UpdateSurface has its own
early-out.

Change-Id: I8772a8cf982739039800f41e89857856aa5693ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2062749Reviewed-by: Khushal <khushalsagar@chromium.org>
Commit-Queue: ccameron <ccameron@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742240}

ui/views/cocoa/native_widget_mac_ns_window_host.mm

@@ -981,11 +981,9 @@ void NativeWidgetMacNSWindowHost::OnWindowMiniaturizedChanged(
 
 void NativeWidgetMacNSWindowHost::OnWindowDisplayChanged(
     const display::Display& new_display) {
-  bool scale_factor_changed =
-      display_.device_scale_factor() != new_display.device_scale_factor();
   bool display_id_changed = display_.id() != new_display.id();
   display_ = new_display;
-  if (scale_factor_changed && compositor_) {
+  if (compositor_) {
     compositor_->UpdateSurface(
         ConvertSizeToPixel(display_.device_scale_factor(),
                            content_bounds_in_screen_.size()),