Revert "Generate tear-off closures dynamically."

dart/sdk/lib/_internal/compiler/implementation/universe/universe.dart

Index: dart/sdk/lib/_internal/compiler/implementation/universe/universe.dart
diff --git a/dart/sdk/lib/_internal/compiler/implementation/universe/universe.dart b/dart/sdk/lib/_internal/compiler/implementation/universe/universe.dart
index 9475947540f1841c2f17f4f445dc151c1e3b968e..8e9d50615742e89fb4871c53f5868c93c9e61418 100644
--- a/dart/sdk/lib/_internal/compiler/implementation/universe/universe.dart
+++ b/dart/sdk/lib/_internal/compiler/implementation/universe/universe.dart
@@ -186,27 +186,15 @@ class Selector {
   factory Selector.fromElement(Element element, Compiler compiler) {
     String name = element.name;
     if (element.isFunction()) {
+      int arity = element.asFunctionElement().requiredParameterCount(compiler);
       if (name == '[]') {
         return new Selector.index();
       } else if (name == '[]=') {
         return new Selector.indexSet();
-      }
-      FunctionSignature signature =
-          element.asFunctionElement().computeSignature(compiler);
-      int arity = signature.parameterCount;
-      List<String> namedArguments = null;
-      if (signature.optionalParametersAreNamed) {
-        namedArguments =
-            signature.orderedOptionalParameters.map((e) => e.name).toList();
-      }
-      if (Elements.operatorNameToIdentifier(name) != name) {
-        // Operators cannot have named arguments, however, that doesn't prevent
-        // a user from declaring such an operator.
-        return new Selector(
-            SelectorKind.OPERATOR, name, null, arity, namedArguments);
+      } else if (Elements.operatorNameToIdentifier(name) != name) {
+        return new Selector(SelectorKind.OPERATOR, name, null, arity);
       } else {
-        return new Selector.call(
-            name, element.getLibrary(), arity, namedArguments);
+        return new Selector.call(name, element.getLibrary(), arity);
       }
     } else if (element.isSetter()) {
       return new Selector.setter(name, element.getLibrary());
@@ -214,9 +202,6 @@ class Selector {
       return new Selector.getter(name, element.getLibrary());
     } else if (element.isField()) {
       return new Selector.getter(name, element.getLibrary());
-    } else {
-      throw new SpannableAssertionFailure(
-          element, "Can't get selector from $element");
     }
   }
 
@@ -605,8 +590,6 @@ class Selector {
   Selector extendIfReachesAll(Compiler compiler) {
     return new TypedSelector(compiler.typesTask.dynamicType, this);
   }
-
-  Selector toCallSelector() => new Selector.callClosureFrom(this);
 }
 
 class TypedSelector extends Selector {