Update selection region style

content/browser/renderer_host/render_widget_host_view_aura.cc

Index: content/browser/renderer_host/render_widget_host_view_aura.cc
diff --git a/content/browser/renderer_host/render_widget_host_view_aura.cc b/content/browser/renderer_host/render_widget_host_view_aura.cc
index f887e756572bd84ea8b95cc7a3c35572587125e6..4bb17af87eb7e5ce8768ada299bf00059ef7b10d 100644
--- a/content/browser/renderer_host/render_widget_host_view_aura.cc
+++ b/content/browser/renderer_host/render_widget_host_view_aura.cc
@@ -2451,7 +2451,12 @@ void RenderWidgetHostViewAura::SnapToPhysicalPixelBoundary() {
   // to avoid the web contents area looking blurry we translate the web contents
   // in the +x, +y direction to land on the nearest pixel boundary. This may
   // cause the bottom and right edges to be clipped slightly, but that's ok.
+#if defined(OS_CHROMEOS)
+  aura::Window* snapped = window_->GetToplevelWindow();
+#else
   aura::Window* snapped = window_->GetRootWindow();
+#endif
+
   if (snapped && snapped != window_)
     ui::SnapLayerToPhysicalPixelBoundary(snapped->layer(), window_->layer());