Revert "Move dart2jslib parts into separate libraries."

pkg/compiler/lib/src/inferrer/inferrer_visitor.dart

Index: pkg/compiler/lib/src/inferrer/inferrer_visitor.dart
diff --git a/pkg/compiler/lib/src/inferrer/inferrer_visitor.dart b/pkg/compiler/lib/src/inferrer/inferrer_visitor.dart
index 093e229130492185ffe63e47425c7feb07b61639..e4725b2d9df52d7e3a7832a1d86b1c93cf7bb1db 100644
--- a/pkg/compiler/lib/src/inferrer/inferrer_visitor.dart
+++ b/pkg/compiler/lib/src/inferrer/inferrer_visitor.dart
@@ -4,21 +4,18 @@
 
 library inferrer_visitor;
 
-import 'dart:collection' show IterableMixin;
-
 import '../constants/constant_system.dart';
 import '../constants/expressions.dart';
 import '../dart2jslib.dart' hide Selector, TypedSelector;
 import '../dart_types.dart';
 import '../elements/elements.dart';
 import '../resolution/operators.dart';
-import '../resolved_visitor.dart';
 import '../tree/tree.dart';
-import '../types/types.dart' show TypeMask;
-import '../types/constants.dart' show computeTypeMask;
 import '../universe/universe.dart';
 import '../util/util.dart';
-import '../world.dart' show ClassWorld;
+import '../types/types.dart' show TypeMask;
+import '../types/constants.dart' show computeTypeMask;
+import 'dart:collection' show IterableMixin;
 
 /**
  * The interface [InferrerVisitor] will use when working on types.