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

tests/compiler/dart2js/simple_inferrer_const_closure_default_test.dart

 // Copyright (c) 2014, 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.
 
 import 'package:expect/expect.dart';
 import "package:async_helper/async_helper.dart";
 import 'compiler_helper.dart';
 import 'type_mask_test_helper.dart';
 
 
@@ skipping 27 matching lines @@
   Function.apply(foo5, []);
   Function.apply(foo6, []);
 }
 """;
 
 
 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);
       var signature = functionElement.functionSignature;
       var element = signature.requiredParameterCount > 0
           ? signature.requiredParameters.first
           : signature.optionalParameters.first;
       Expect.equals(type,
           simplify(typesInferrer.getTypeOfElement(element), compiler),
           functionName);
     }
 
     checkOptionalArgument(String functionName, type) {
       var functionElement = findElement(compiler, functionName);
       var signature = functionElement.functionSignature;
       var element = signature.optionalParameters.first;
       Expect.equals(type,
           simplify(typesInferrer.getTypeOfElement(element), compiler),
           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
   }));
 }