Rename the global inference task and reduce it's API surface by introducing the

tests/compiler/dart2js/simple_inferrer_const_closure_test.dart

Index: tests/compiler/dart2js/simple_inferrer_const_closure_test.dart
diff --git a/tests/compiler/dart2js/simple_inferrer_const_closure_test.dart b/tests/compiler/dart2js/simple_inferrer_const_closure_test.dart
index 3f3056c014195b3de9cc7d7feaf2d3d305a800dd..411269fbeefcc8020ec236b1fc864ea4d549a6ac 100644
--- a/tests/compiler/dart2js/simple_inferrer_const_closure_test.dart
+++ b/tests/compiler/dart2js/simple_inferrer_const_closure_test.dart
@@ -38,7 +38,7 @@ void main() {
   Uri uri = new Uri(scheme: 'source');
   var compiler = compilerFor(TEST, uri);
   asyncTest(() => compiler.run(uri).then((_) {
-    var typesInferrer = compiler.typesTask.typesInferrer;
+    var typesInferrer = compiler.globalInference.typesInferrer;
 
     checkReturn(String name, type) {
       var element = findElement(compiler, name);
@@ -47,10 +47,10 @@ void main() {
           name);
     }
 
-    checkReturn('method1', compiler.typesTask.uint31Type);
-    checkReturn('returnInt1', compiler.typesTask.uint31Type);
+    checkReturn('method1', compiler.commonMasks.uint31Type);
+    checkReturn('returnInt1', compiler.commonMasks.uint31Type);
 
-    checkReturn('method2', compiler.typesTask.uint31Type);
-    checkReturn('returnInt2', compiler.typesTask.uint31Type);
+    checkReturn('method2', compiler.commonMasks.uint31Type);
+    checkReturn('returnInt2', compiler.commonMasks.uint31Type);
   }));
 }