Revert "Compute frontend/backend specific constants."

tests/compiler/dart2js/exit_code_test.dart

 // Copyright (c) 2013, 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.
 
 // Test the exit code of dart2js in case of exceptions, fatal errors, errors,
 // warnings, etc.
 
 
 import 'dart:async';
 import 'dart:io' show Platform;
@@ skipping 21 matching lines @@
                 Uri libraryRoot,
                 Uri packageRoot,
                 List<String> options,
                 Map<String, dynamic> environment,
                 String this.testMarker,
                 String this.testType,
                 Function this.onTest)
       : super(inputProvider, outputProvider, handler, libraryRoot,
               packageRoot, options, environment) {
     scanner = new TestScanner(this);
-    resolver = new TestResolver(this, backend.constantCompilerTask);
+    resolver = new TestResolver(this);
     test('Compiler');
   }
 
   Future<bool> run(Uri uri) {
     test('Compiler.run');
     return super.run(uri);
   }
 
   Future scanBuiltinLibraries() {
     test('Compiler.scanBuiltinLibraries');
@@ skipping 69 matching lines @@
 
   TestCompiler get compiler => super.compiler;
 
   void scanElements(CompilationUnitElement compilationUnit) {
     compiler.test('ScannerTask.scanElements');
     super.scanElements(compilationUnit);
   }
 }
 
 class TestResolver extends ResolverTask {
-  TestResolver(TestCompiler compiler, ConstantCompiler constantCompiler)
-      : super(compiler, constantCompiler);
+  TestResolver(TestCompiler compiler) : super(compiler);
 
   TestCompiler get compiler => super.compiler;
 
   void computeClassMembers(ClassElement element) {
     compiler.test('ResolverTask.computeClassMembers');
     super.computeClassMembers(element);
   }
 }
 
 int checkedResults = 0;
@@ skipping 120 matching lines @@
     int countResults(Map runType) {
       return runType.length *
              tests.values.where((r) => r == runType).length;
     }
 
     Expect.equals(countResults(beforeRun) + countResults(duringRun),
                   checkedResults);
     asyncEnd();
   });
 }