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

tests/compiler/dart2js/simple_inferrer_callers_test.dart

Index: tests/compiler/dart2js/simple_inferrer_callers_test.dart
diff --git a/tests/compiler/dart2js/simple_inferrer_callers_test.dart b/tests/compiler/dart2js/simple_inferrer_callers_test.dart
index 2242d5564404069396adeca917d68ccade091c6c..b4f4c2a9e76570ce1766f3069a0d8922abaf9271 100644
--- a/tests/compiler/dart2js/simple_inferrer_callers_test.dart
+++ b/tests/compiler/dart2js/simple_inferrer_callers_test.dart
@@ -29,15 +29,15 @@ main() {
 // Create our own type inferrer to avoid clearing out the internal
 // data structures.
 class MyInferrer extends TypeGraphInferrer {
-  MyInferrer(compiler) : super(compiler);
+  MyInferrer(compiler, commonMasks) : super(compiler, commonMasks);
   clear() {}
 }
 
 void main() {
   Uri uri = new Uri(scheme: 'source');
   var compiler = compilerFor(TEST, uri);
-  var inferrer = new MyInferrer(compiler);
-  compiler.typesTask.typesInferrer = inferrer;
+  var inferrer = new MyInferrer(compiler, compiler.commonMasks);
+  compiler.globalInference.typesInferrer = inferrer;
   asyncTest(() => compiler.run(uri).then((_) {
     var mainElement = findElement(compiler, 'main');
     var classA = findElement(compiler, 'A');