Revert "Update all Angular libs (run update_all.sh)."

third_party/pkg/angular/lib/core_dom/shadowless_shadow_root.dart

Index: third_party/pkg/angular/lib/core_dom/shadowless_shadow_root.dart
diff --git a/third_party/pkg/angular/lib/core_dom/shadowless_shadow_root.dart b/third_party/pkg/angular/lib/core_dom/shadowless_shadow_root.dart
deleted file mode 100644
index d4994a458606a15df3f570a3b7d3397705bc312d..0000000000000000000000000000000000000000
--- a/third_party/pkg/angular/lib/core_dom/shadowless_shadow_root.dart
+++ /dev/null
@@ -1,12 +0,0 @@
-part of angular.core.dom_internal;
-
-@proxy
-class ShadowlessShadowRoot implements dom.ShadowRoot {
-  dom.Element _element;
-
-  ShadowlessShadowRoot(this._element);
-
-  noSuchMethod(Invocation invocation) {
-    throw new UnimplementedError("Not yet implemented in ShadowlessShadowRoot.");
-  }
-}