Fix tests to run with the new analysis driver.

pkg/analyzer/test/generated/static_warning_code_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.
 
 library analyzer.test.generated.static_warning_code_test;
 
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/src/error/codes.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/source_io.dart';
@@ skipping 356 matching lines @@
 }''');
     addNamedSource(
         "/lib2.dart",
         r'''
 library lib2;
 class _A {}
 g(h(_A a)) {}''');
     // The name _A is private to the library it's defined in, so this is a type
     // mismatch. Furthermore, the error message should mention both _A and the
     // filenames so the user can figure out what's going on.
-    List<AnalysisError> errors = analysisContext2.computeErrors(source);
+    TestAnalysisResult analysisResult = await computeAnalysisResult(source);
+    List<AnalysisError> errors = analysisResult.errors;
     expect(errors, hasLength(1));
     AnalysisError error = errors[0];
     expect(StaticWarningCode.ARGUMENT_TYPE_NOT_ASSIGNABLE, error.errorCode);
     String message = error.message;
     expect(message.indexOf("_A") != -1, isTrue);
     expect(message.indexOf("lib1.dart") != -1, isTrue);
     expect(message.indexOf("lib2.dart") != -1, isTrue);
   }
 
   test_argumentTypeNotAssignable_annotation_namedConstructor() async {
@@ skipping 3318 matching lines @@
 
   test_voidReturnForGetter() async {
     Source source = addSource(r'''
 class S {
   void get value {}
 }''');
     await computeAnalysisResult(source);
     assertErrors(source, [StaticWarningCode.VOID_RETURN_FOR_GETTER]);
   }
 }