Rename Universe to WorldBuilder.

pkg/compiler/lib/src/compiler.dart

Index: pkg/compiler/lib/src/compiler.dart
diff --git a/pkg/compiler/lib/src/compiler.dart b/pkg/compiler/lib/src/compiler.dart
index 6acc8ecceab53da723e4e9bdefee6566168759fb..7e9c204b7ba9858a09fd4daeb0c053727c2afb24 100644
--- a/pkg/compiler/lib/src/compiler.dart
+++ b/pkg/compiler/lib/src/compiler.dart
@@ -73,7 +73,8 @@ import 'typechecker.dart' show TypeCheckerTask;
 import 'types/types.dart' show GlobalTypeInferenceTask;
 import 'types/masks.dart' show CommonMasks;
 import 'universe/selector.dart' show Selector;
-import 'universe/universe.dart' show ResolutionUniverse, CodegenUniverse;
+import 'universe/world_builder.dart'
+    show ResolutionWorldBuilder, CodegenWorldBuilder;
 import 'universe/use.dart' show StaticUse;
 import 'universe/world_impact.dart' show ImpactStrategy, WorldImpact;
 import 'util/util.dart' show Link, Setlet;
@@ -333,8 +334,8 @@ abstract class Compiler implements LibraryLoaderListener {
 
   // TODO(johnniwinther): Rename these appropriately when unification of worlds/
   // universes is complete.
-  ResolutionUniverse get resolverWorld => enqueuer.resolution.universe;
-  CodegenUniverse get codegenWorld => enqueuer.codegen.universe;
+  ResolutionWorldBuilder get resolverWorld => enqueuer.resolution.universe;
+  CodegenWorldBuilder get codegenWorld => enqueuer.codegen.universe;
 
   bool get analyzeAll => options.analyzeAll || compileAll;