Expose 'typeProvider' from AnalysisContext.

pkg/analyzer/test/generated/all_the_rest_test.dart

 // Copyright (c) 2014, 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.
 
 // This code was auto-generated, is not intended to be edited, and is subject to
 // significant change. Please see the README file for more information.
 
 library engine.all_the_rest_test;
 
 import 'dart:collection';
@@ skipping 824 matching lines @@
         analysisContext.resolveCompilationUnit(source, library);
     expect(unit, isNotNull);
     NodeList<CompilationUnitMember> declarations = unit.declarations;
     expect(declarations, hasLength(1));
     CompilationUnitMember declaration = declarations[0];
     EngineTestCase.assertInstanceOf((obj) => obj is TopLevelVariableDeclaration,
         TopLevelVariableDeclaration, declaration);
     NodeList<VariableDeclaration> variables =
         (declaration as TopLevelVariableDeclaration).variables.variables;
     expect(variables, hasLength(1));
-    ConstantEvaluator evaluator = new ConstantEvaluator(
-        source, (analysisContext as AnalysisContextImpl).typeProvider);
+    ConstantEvaluator evaluator =
+        new ConstantEvaluator(source, analysisContext.typeProvider);
     return evaluator.evaluate(variables[0].initializer);
   }
 }
 
 @reflectiveTest
 class ConstantFinderTest extends EngineTestCase {
   AstNode _node;
 
   /**
    * Test an annotation that consists solely of an identifier (and hence
@@ skipping 7724 matching lines @@
     if (_expectedExternalScriptName == null) {
       expect(scriptSource, isNull, reason: "script $scriptIndex");
     } else {
       expect(scriptSource, isNotNull, reason: "script $scriptIndex");
       String actualExternalScriptName = scriptSource.shortName;
       expect(actualExternalScriptName, _expectedExternalScriptName,
           reason: "script $scriptIndex");
     }
   }
 }