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

tests/compiler/dart2js/simple_inferrer_const_closure_default_test.dart

Index: tests/compiler/dart2js/simple_inferrer_const_closure_default_test.dart
diff --git a/tests/compiler/dart2js/simple_inferrer_const_closure_default_test.dart b/tests/compiler/dart2js/simple_inferrer_const_closure_default_test.dart
index f83a4d95e802ee9af9ca96a1ee2b7e92188b653c..33fdc43ebde642b6531c3a3b0fd4abf5fc414742 100644
--- a/tests/compiler/dart2js/simple_inferrer_const_closure_default_test.dart
+++ b/tests/compiler/dart2js/simple_inferrer_const_closure_default_test.dart
@@ -45,7 +45,7 @@ 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;
 
     checkArgument(String functionName, type) {
       var functionElement = findElement(compiler, functionName);
@@ -67,18 +67,18 @@ void main() {
           functionName);
     }
 
-    checkArgument('foo1', compiler.typesTask.functionType);   /// 01: ok
-    checkArgument('foo2', compiler.typesTask.functionType);   /// 02: ok
-    checkArgument('foo3', compiler.typesTask.functionType);   /// 03: ok
-    checkArgument('foo4', compiler.typesTask.functionType);   /// 04: ok
-    checkArgument('foo5', compiler.typesTask.dynamicType);    /// 05: ok
-    checkArgument('foo6', compiler.typesTask.dynamicType);    /// 06: ok
+    checkArgument('foo1', compiler.commonMasks.functionType);   /// 01: ok
+    checkArgument('foo2', compiler.commonMasks.functionType);   /// 02: ok
+    checkArgument('foo3', compiler.commonMasks.functionType);   /// 03: ok
+    checkArgument('foo4', compiler.commonMasks.functionType);   /// 04: ok
+    checkArgument('foo5', compiler.commonMasks.dynamicType);    /// 05: ok
+    checkArgument('foo6', compiler.commonMasks.dynamicType);    /// 06: ok
 
-    checkArgument('defaultFn1', compiler.typesTask.uint31Type);   /// 07: ok
-    checkArgument('defaultFn2', compiler.typesTask.uint31Type);   /// 08: ok
-    checkArgument('defaultFn3', compiler.typesTask.uint31Type);   /// 09: ok
-    checkArgument('defaultFn4', compiler.typesTask.uint31Type);   /// 10: ok
-    checkArgument('defaultFn5', compiler.typesTask.uint31Type);   /// 11: ok
-    checkArgument('defaultFn6', compiler.typesTask.uint31Type);   /// 12: ok
+    checkArgument('defaultFn1', compiler.commonMasks.uint31Type);   /// 07: ok
+    checkArgument('defaultFn2', compiler.commonMasks.uint31Type);   /// 08: ok
+    checkArgument('defaultFn3', compiler.commonMasks.uint31Type);   /// 09: ok
+    checkArgument('defaultFn4', compiler.commonMasks.uint31Type);   /// 10: ok
+    checkArgument('defaultFn5', compiler.commonMasks.uint31Type);   /// 11: ok
+    checkArgument('defaultFn6', compiler.commonMasks.uint31Type);   /// 12: ok
   }));
 }