Move parser and token related libraries into their own subfolder.

tests/compiler/dart2js/parser_helper.dart

Index: tests/compiler/dart2js/parser_helper.dart
diff --git a/tests/compiler/dart2js/parser_helper.dart b/tests/compiler/dart2js/parser_helper.dart
index b9162ef1bf765dfa54acc93875e1cb18fceb9bb7..4791dc19a09969d5106b70dfee0dcf1299e1136d 100644
--- a/tests/compiler/dart2js/parser_helper.dart
+++ b/tests/compiler/dart2js/parser_helper.dart
@@ -8,11 +8,11 @@ import "package:expect/expect.dart";
 
 import "package:compiler/src/elements/elements.dart";
 import "package:compiler/src/tree/tree.dart";
-import "package:compiler/src/scanner/listener.dart";
-import "package:compiler/src/scanner/parser.dart";
-import "package:compiler/src/scanner/partial_parser.dart";
+import "package:compiler/src/parser/listener.dart";
+import "package:compiler/src/parser/parser.dart";
+import "package:compiler/src/parser/partial_parser.dart";
 import "package:compiler/src/scanner/string_scanner.dart";
-import "package:compiler/src/scanner/token.dart";
+import "package:compiler/src/tokens/token.dart";
 import "package:compiler/src/io/source_file.dart";
 import "package:compiler/src/util/util.dart";
 
@@ -27,10 +27,10 @@ import "package:compiler/src/diagnostics/messages.dart";
 import "package:compiler/src/script.dart";
 
 export "package:compiler/src/diagnostics/diagnostic_listener.dart";
-export 'package:compiler/src/scanner/listener.dart';
-export 'package:compiler/src/scanner/parser.dart';
-export 'package:compiler/src/scanner/partial_parser.dart';
-export "package:compiler/src/scanner/token.dart";
+export 'package:compiler/src/parser/listener.dart';
+export 'package:compiler/src/parser/parser.dart';
+export 'package:compiler/src/parser/partial_parser.dart';
+export "package:compiler/src/tokens/token.dart";
 
 class LoggerCanceler implements DiagnosticListener {
   void log(message) {