Expose 'typeProvider' from AnalysisContext.

pkg/analyzer/test/generated/all_the_rest_test.dart

Index: pkg/analyzer/test/generated/all_the_rest_test.dart
diff --git a/pkg/analyzer/test/generated/all_the_rest_test.dart b/pkg/analyzer/test/generated/all_the_rest_test.dart
index 845711da816dd877e4040c889fd355701929fe35..918c81be734be982b3b0db3ad9182ea527bb9c74 100644
--- a/pkg/analyzer/test/generated/all_the_rest_test.dart
+++ b/pkg/analyzer/test/generated/all_the_rest_test.dart
@@ -842,8 +842,8 @@ class ConstantEvaluatorTest extends ResolverTestCase {
     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);
   }
 }