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

tests/compiler/dart2js/closure_tracer_test.dart

Index: tests/compiler/dart2js/closure_tracer_test.dart
diff --git a/tests/compiler/dart2js/closure_tracer_test.dart b/tests/compiler/dart2js/closure_tracer_test.dart
index 86d1e2fcd8f07aec7e051812c34124d4e0ac9674..f8718e46b71f2e9b5066b03adcd81645f7084cf3 100644
--- a/tests/compiler/dart2js/closure_tracer_test.dart
+++ b/tests/compiler/dart2js/closure_tracer_test.dart
@@ -154,8 +154,8 @@ void main() {
   Uri uri = new Uri(scheme: 'source');
   var compiler = compilerFor(TEST, uri);
   asyncTest(() => compiler.run(uri).then((_) {
-    var typesTask = compiler.typesTask;
-    var typesInferrer = typesTask.typesInferrer;
+    var commonMasks = compiler.commonMasks;
+    var typesInferrer = compiler.globalInference.typesInferrer;
 
     checkType(String name, type) {
       var element = findElement(compiler, name);
@@ -163,18 +163,18 @@ void main() {
       Expect.equals(type.nullable(), simplify(mask, compiler), name);
     }
 
-    checkType('testFunctionStatement', typesTask.uint31Type);
-    checkType('testFunctionExpression', typesTask.uint31Type);
-    checkType('testStoredInInstance', typesTask.uint31Type);
-    checkType('testStoredInStatic', typesTask.uint31Type);
-    checkType('testStoredInMapOfList', typesTask.uint31Type);
-    checkType('testStoredInListOfList', typesTask.uint31Type);
-    checkType('testStoredInListOfListUsingInsert', typesTask.uint31Type);
-    checkType('testStoredInListOfListUsingAdd', typesTask.uint31Type);
-    checkType('testPassedInParameter', typesTask.uint31Type);
-    checkType('testStaticClosure1', typesTask.uint31Type);
-    checkType('testStaticClosure2', typesTask.numType);
-    checkType('testStaticClosure3', typesTask.uint31Type);
-    checkType('testStaticClosure4', typesTask.numType);
+    checkType('testFunctionStatement', commonMasks.uint31Type);
+    checkType('testFunctionExpression', commonMasks.uint31Type);
+    checkType('testStoredInInstance', commonMasks.uint31Type);
+    checkType('testStoredInStatic', commonMasks.uint31Type);
+    checkType('testStoredInMapOfList', commonMasks.uint31Type);
+    checkType('testStoredInListOfList', commonMasks.uint31Type);
+    checkType('testStoredInListOfListUsingInsert', commonMasks.uint31Type);
+    checkType('testStoredInListOfListUsingAdd', commonMasks.uint31Type);
+    checkType('testPassedInParameter', commonMasks.uint31Type);
+    checkType('testStaticClosure1', commonMasks.uint31Type);
+    checkType('testStaticClosure2', commonMasks.numType);
+    checkType('testStaticClosure3', commonMasks.uint31Type);
+    checkType('testStaticClosure4', commonMasks.numType);
   }));
 }