Move scanner into pkg/front_end/lib/src/scanner.

pkg/analyzer/test/generated/resolver_test_case.dart

Index: pkg/analyzer/test/generated/resolver_test_case.dart
diff --git a/pkg/analyzer/test/generated/resolver_test_case.dart b/pkg/analyzer/test/generated/resolver_test_case.dart
index 1997423590cad3486e341e69f5d43e591948d7d9..32b42e9d43361592d94b425f43d280c29526daca 100644
--- a/pkg/analyzer/test/generated/resolver_test_case.dart
+++ b/pkg/analyzer/test/generated/resolver_test_case.dart
@@ -369,7 +369,7 @@ class ResolverTestCase extends EngineTestCase {
    *           expected
    */
   void assertErrors(Source source,
-      [List<ErrorCode> expectedErrorCodes = ErrorCode.EMPTY_LIST]) {
+      [List<ErrorCode> expectedErrorCodes = const <ErrorCode>[]]) {
     GatheringErrorListener errorListener = new GatheringErrorListener();
     for (AnalysisError error in analysisContext2.computeErrors(source)) {
       expect(error.source, source);