Revert "Remove JavaScriptBackend from ClosedWorldBase"

pkg/compiler/lib/src/compiler.dart

 // Copyright (c) 2012, 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.
 
 library dart2js.compiler_base;
 
 import 'dart:async' show Future;
 
 import '../compiler_new.dart' as api;
 import 'closure.dart' as closureMapping show ClosureTask;
@@ skipping 608 matching lines @@
         resolveLibraryMetadata();
         reporter.log('Resolving...');
         MethodElement mainMethod;
         if (mainFunction != null && !mainFunction.isMalformed) {
           mainFunction.computeType(resolution);
           mainMethod = mainFunction;
         }
 
         processQueue(resolutionEnqueuer, mainMethod, libraryLoader.libraries,
             onProgress: showResolutionProgress);
-        backend.onResolutionEnd();
         resolutionEnqueuer.logSummary(reporter.log);
 
         _reporter.reportSuppressedMessagesSummary();
 
         if (compilationFailed) {
           if (!options.generateCodeWithCompileTimeErrors) return;
           if (!backend
               .enableCodegenWithErrorsIfSupported(NO_LOCATION_SPANNABLE)) {
             return;
           }
@@ skipping 58 matching lines @@
 
         backend.onCodegenEnd();
 
         checkQueues(resolutionEnqueuer, codegenEnqueuer);
       });
 
   /// Perform the steps needed to fully end the resolution phase.
   ClosedWorldRefiner closeResolution() {
     phase = PHASE_DONE_RESOLVING;
 
-    ClosedWorldImpl world = resolutionWorldBuilder.closeWorld();
+    ClosedWorldImpl world = resolutionWorldBuilder.closeWorld(reporter);
     // Compute whole-program-knowledge that the backend needs. (This might
     // require the information computed in [world.closeWorld].)
-    backend.onResolutionClosedWorld(world, world);
+    backend.onResolutionComplete(world, world);
 
     deferredLoadTask.onResolutionComplete(mainFunction);
 
     // TODO(johnniwinther): Move this after rti computation but before
     // reflection members computation, and (re-)close the world afterwards.
     closureToClassMapper.createClosureClasses(world);
     return world;
   }
 
   /// Compute the [WorldImpact] for accessing all elements in [library].
@@ skipping 1277 matching lines @@
   ResolutionFunctionType getLocalFunctionType(LocalFunctionElement function) {
     return function.type;
   }
 
   @override
   ResolutionDartType getUnaliasedType(ResolutionDartType type) {
     type.computeUnaliased(_resolution);
     return type.unaliased;
   }
 }