Fix a bug in the type inferrer, where a getter call was not seen as a potential closure call.

sdk/lib/_internal/compiler/implementation/inferrer/closure_tracer.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 type_graph_inferrer;
 
 class ClosureTracerVisitor extends TracerVisitor {
   ClosureTracerVisitor(tracedType, inferrer) : super(tracedType, inferrer);
 
   void run() {
@@ skipping 36 matching lines @@
       bailout('Passed to a closure');
     }
   }
 
   visitStaticCallSiteTypeInformation(StaticCallSiteTypeInformation info) {
     super.visitStaticCallSiteTypeInformation(info);
     Element called = info.calledElement;
     if (called.isForeign(compiler) && called.name == 'JS') {
       bailout('Used in JS ${info.call}');
     }
+    if (inferrer.types.getInferredTypeOf(called) == currentUser) {
+      // This node can be a closure call as well. For example, `foo()`
+      // where `foo` is a getter.
+      analyzeCall(info);
+    }
   }
 
   bool checkIfCurrentUser(element) {
     return inferrer.types.getInferredTypeOf(element) == currentUser;
   }
 
   visitDynamicCallSiteTypeInformation(DynamicCallSiteTypeInformation info) {
     super.visitDynamicCallSiteTypeInformation(info);
     if (info.selector.isCall()) {
       if (info.arguments.contains(currentUser)
           && !info.targets.every((element) => element.isFunction())) {
         bailout('Passed to a closure');
       } else if (info.targets.any((element) => checkIfCurrentUser(element))) {
         analyzeCall(info);
       }
     }
   }
 }