Fix remaining uses of lookupConstructor.

pkg/compiler/lib/src/cps_ir/cps_ir_builder_visitor.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart2js.ir_builder;
 
 /**
  * This task iterates through all resolved elements and builds [ir.Node]s. The
  * nodes are stored in the [nodes] map and accessible through [hasIr] and
  * [getIr].
@@ skipping 219 matching lines @@
                                "Unexpected initializer type $initializer");
       }
 
     }
     if (!explicitSuperInitializer) {
       // No super initializer found. Try to find the default constructor if
       // the class is not Object.
       ClassElement enclosingClass = element.enclosingClass;
       if (!enclosingClass.isObject) {
         ClassElement superClass = enclosingClass.superclass;
-        Selector selector =
-            new Selector.callDefaultConstructor(enclosingClass.library);
-        FunctionElement target = superClass.lookupConstructor(selector);
+        FunctionElement target = superClass.lookupDefaultConstructor();
         if (target == null) {
           compiler.internalError(superClass,
               "No default constructor available.");
         }
+        Selector selector = new Selector.fromElement(target);
         result.add(irBuilder.makeSuperInitializer(target,
                                                   <ir.RunnableBody>[],
                                                   selector));
       }
     }
     return result;
   }
 
   ir.Primitive visit(ast.Node node) => node.accept(this);
 
@@ skipping 1108 matching lines @@
           hasConstructorCall = true;
         } else {
           compiler.internalError(initializer,
                                  "Unexpected initializer type $initializer");
         }
       }
     }
     // If no super() or this() was found, also call default superconstructor.
     if (!hasConstructorCall && !enclosingClass.isObject) {
       ClassElement superClass = enclosingClass.superclass;
-      Selector selector =
-          new Selector.callDefaultConstructor(enclosingClass.library);
-      FunctionElement target = superClass.lookupConstructor(selector);
+      FunctionElement target = superClass.lookupDefaultConstructor();
       if (target == null) {
         compiler.internalError(superClass, "No default constructor available.");
       }
       evaluateConstructorFieldInitializers(target, supers);
     }
     // Add this constructor after the superconstructors.
     supers.add(constructor);
   }
 
   /// In preparation of inlining (part of) [target], the [arguments] are moved
@@ skipping 155 matching lines @@
         element,
         node,
         elements);
     IrBuilder builder =
         new JsIrBuilder(compiler.backend.constantSystem, element);
     return withBuilder(builder, () => _makeFunctionBody(element, node));
   }
 
 }