Remove Compiler access from ResolutionEnqueuer

pkg/compiler/lib/src/types/types.dart

Index: pkg/compiler/lib/src/types/types.dart
diff --git a/pkg/compiler/lib/src/types/types.dart b/pkg/compiler/lib/src/types/types.dart
index ad890dc6c79f6aaaee44a7880f2eb00d1abbeba8..eac9b46233dd81959705e0cdfd0e4709499e17e9 100644
--- a/pkg/compiler/lib/src/types/types.dart
+++ b/pkg/compiler/lib/src/types/types.dart
@@ -128,23 +128,26 @@ class GlobalTypeInferenceTask extends CompilerTask {
   final String name = 'Type inference';
 
   final Compiler compiler;
-  TypesInferrer typesInferrer;
-  CommonMasks masks;
+
+  /// The [TypeInferrer] used by the global type inference. This should by
+  /// accessed from outside this class for testing only.
+  TypesInferrer typesInferrerInternal;
+
   GlobalTypeInferenceResults results;
 
   GlobalTypeInferenceTask(Compiler compiler)
-      : masks = new CommonMasks(compiler),
-        compiler = compiler,
-        super(compiler.measurer) {
-    typesInferrer = new TypeGraphInferrer(compiler, masks);
-  }
+      : compiler = compiler,
+        super(compiler.measurer);
 
   /// Runs the global type-inference algorithm once.
   void runGlobalTypeInference(Element mainElement) {
     measure(() {
-      typesInferrer.analyzeMain(mainElement);
-      typesInferrer.clear();
-      results = new GlobalTypeInferenceResults(typesInferrer, compiler, masks);
+      CommonMasks masks = compiler.closedWorld.commonMasks;
+      typesInferrerInternal ??= new TypeGraphInferrer(compiler, masks);
+      typesInferrerInternal.analyzeMain(mainElement);
+      typesInferrerInternal.clear();
+      results = new GlobalTypeInferenceResults(
+          typesInferrerInternal, compiler, masks);
     });
   }
 }