Move DomProxyMixin to this package

lib/src/init.dart

Index: lib/src/init.dart
diff --git a/lib/src/init.dart b/lib/src/init.dart
index 47d39eabbae7f9ec1da5450a14a7d7db1711f8e4..d2906ef8f13c928e0ada77662c7d4eafdf76972d 100644
--- a/lib/src/init.dart
+++ b/lib/src/init.dart
@@ -23,8 +23,9 @@ Future initWebComponents({List<Type> typeFilter, InitializerFilter customFilter,
   if (typeFilter != null || customFilter != null) {
     return init.run(typeFilter: typeFilter, customFilter: customFilter);
   } else {
-    return init.run(typeFilter: [HtmlImport])
-      .then((_) => init.run(typeFilter: [CustomElement, CustomElementProxy]))
-      .then((_) => initAll ? init.run() : null);
+    return init
+        .run(typeFilter: [HtmlImport])
+        .then((_) => init.run(typeFilter: [CustomElement, CustomElementProxy]))
+        .then((_) => initAll ? init.run() : null);
   }
 }