Remove ugly check for super.created call in constructor

tools/dom/templates/html/impl/impl_HTMLDocument.darttemplate

Index: tools/dom/templates/html/impl/impl_HTMLDocument.darttemplate
diff --git a/tools/dom/templates/html/impl/impl_HTMLDocument.darttemplate b/tools/dom/templates/html/impl/impl_HTMLDocument.darttemplate
index 1b4b7e6df09b6fb2aa55f65ccf23e5c174f0e184..191d2db93516572a90a96c2fe9d2c416bb2a3087 100644
--- a/tools/dom/templates/html/impl/impl_HTMLDocument.darttemplate
+++ b/tools/dom/templates/html/impl/impl_HTMLDocument.darttemplate
@@ -295,16 +295,9 @@ $if DARTIUM
             createdParametersValid = createdParametersValid && parameter.isOptional;
           });
         }
-
-        // Get the created constructor source and look at the initializer;
-        // Must call super.created() if not its as an error.
-        var createdSource = methodMirror.source;
-        superCreatedCalled = createdSource.contains("super.created(");
       }
 
-      if (!superCreatedCalled) {
-        throw new DomException.jsInterop('created constructor initializer must call super.created()');
-      } else if (!createdParametersValid) {
+      if (!createdParametersValid) {
         throw new DomException.jsInterop('created constructor must have no parameters');
       }