Change signature of lookupConstructor to only require a name.

pkg/compiler/lib/src/compile_time_constants.dart

Index: pkg/compiler/lib/src/compile_time_constants.dart
diff --git a/pkg/compiler/lib/src/compile_time_constants.dart b/pkg/compiler/lib/src/compile_time_constants.dart
index 271ff8da1f47b25e9845f9f29f518e3dbfed3d47..84f412cd1531b45d7f19dd3f0c175d47042e5b1a 100644
--- a/pkg/compiler/lib/src/compile_time_constants.dart
+++ b/pkg/compiler/lib/src/compile_time_constants.dart
@@ -1043,19 +1043,17 @@ class ConstructorEvaluator extends CompileTimeConstantEvaluator {
         assert(superClass != null);
         assert(superClass.resolutionState == STATE_DONE);
 
-        Selector selector =
-            new Selector.callDefaultConstructor(enclosingClass.library);
-
         FunctionElement targetConstructor =
-            superClass.lookupConstructor(selector);
-        if (targetConstructor == null) {
-          compiler.internalError(functionNode,
-              "No default constructor available.");
+            superClass.lookupDefaultConstructor();
+        // If we do not find a default constructor, an error was reported
+        // already and compilation will fail anyway. So just ignore that case.
+        if (targetConstructor != null) {
+          Selector selector =
+             new Selector.callDefaultConstructor(enclosingClass.library);
+          List<AstConstant> compiledArguments = evaluateArgumentsToConstructor(
+              functionNode, selector, const Link<Node>(), targetConstructor);
+          evaluateSuperOrRedirectSend(compiledArguments, targetConstructor);
         }
-        List<AstConstant> compiledArguments =
-            evaluateArgumentsToConstructor(
-                functionNode, selector, const Link<Node>(), targetConstructor);
-        evaluateSuperOrRedirectSend(compiledArguments, targetConstructor);
       }
     }
   }