Fix root ServerWindow size.

services/ui/ws/display.cc

Index: services/ui/ws/display.cc
diff --git a/services/ui/ws/display.cc b/services/ui/ws/display.cc
index d9b1c1e72b1cd45f6f20a3bf607e326f9dbb97c6..f7a1ed1d3b2b553917445fb4b0a24054b8a2fe2c 100644
--- a/services/ui/ws/display.cc
+++ b/services/ui/ws/display.cc
@@ -294,12 +294,11 @@ void Display::OnNativeCaptureLost() {
     display_root->window_manager_state()->SetCapture(nullptr, kInvalidClientId);
 }
 
-void Display::OnViewportMetricsChanged(
-    const display::ViewportMetrics& new_metrics) {
-  if (!root_ || root_->bounds().size() == new_metrics.bounds.size())
+void Display::UpdateRootWindowSize(const gfx::Size& new_size) {
+  if (root_->bounds().size() == new_size)
     return;
 
-  gfx::Rect new_bounds(new_metrics.bounds.size());
+  gfx::Rect new_bounds(new_size);
   root_->SetBounds(new_bounds);
   for (auto& pair : window_manager_display_root_map_)
     pair.second->root()->SetBounds(new_bounds);