Fix use after free for cached_displays_.

ui/ozone/platform/drm/host/drm_native_display_delegate.cc

Index: ui/ozone/platform/drm/host/drm_native_display_delegate.cc
diff --git a/ui/ozone/platform/drm/host/drm_native_display_delegate.cc b/ui/ozone/platform/drm/host/drm_native_display_delegate.cc
index 0a16a7ee600746ce731bec2a141c12c2888079a4..2fb5777c024eb01716abf90d81728d839dd5d252 100644
--- a/ui/ozone/platform/drm/host/drm_native_display_delegate.cc
+++ b/ui/ozone/platform/drm/host/drm_native_display_delegate.cc
@@ -25,6 +25,11 @@ void DrmNativeDisplayDelegate::OnConfigurationChanged() {
     observer.OnConfigurationChanged();
 }
 
+void DrmNativeDisplayDelegate::OnDisplaySnapshotsInvalidated() {
+  for (NativeDisplayObserver& observer : observers_)
+    observer.OnDisplaySnapshotsInvalidated();
+}
+
 void DrmNativeDisplayDelegate::Initialize() {
   display_manager_->AddDelegate(this);
 }