MacViews: Fix WidgetWithDestroyedNativeViewTest.Test

ui/views/widget/native_widget_mac.mm

Index: ui/views/widget/native_widget_mac.mm
diff --git a/ui/views/widget/native_widget_mac.mm b/ui/views/widget/native_widget_mac.mm
index c0951c8a8b20835d7206dab912ac828bea9080f0..859da3a54f8ac6e10eb4e2d8e70c3ed8ac042832 100644
--- a/ui/views/widget/native_widget_mac.mm
+++ b/ui/views/widget/native_widget_mac.mm
@@ -195,11 +195,15 @@ void NativeWidgetMac::ViewRemoved(View* view) {
 }
 
 void NativeWidgetMac::SetNativeWindowProperty(const char* name, void* value) {
-  bridge_->SetNativeWindowProperty(name, value);
+  if (bridge_)
+    bridge_->SetNativeWindowProperty(name, value);
 }
 
 void* NativeWidgetMac::GetNativeWindowProperty(const char* name) const {
-  return bridge_->GetNativeWindowProperty(name);
+  if (bridge_)
+    return bridge_->GetNativeWindowProperty(name);
+
+  return nullptr;
 }
 
 TooltipManager* NativeWidgetMac::GetTooltipManager() const {