Moved the testing scripts to the new import/library/part syntax

tools/testing/dart/test_runner.dart

Index: tools/testing/dart/test_runner.dart
diff --git a/tools/testing/dart/test_runner.dart b/tools/testing/dart/test_runner.dart
index cf54160f755cc1e648d3e0ca9988f400738e3f7e..335766a1bc63f1f59a1bd9726241f09026991a86 100644
--- a/tools/testing/dart/test_runner.dart
+++ b/tools/testing/dart/test_runner.dart
@@ -9,14 +9,14 @@
  * - Managing parallel execution of tests, including timeout checks.
  * - Evaluating the output of each test as pass/fail/crash/timeout.
  */
-#library("test_runner");
-
-#import("dart:io");
-#import("dart:isolate");
-#import("dart:uri");
-#import("status_file_parser.dart");
-#import("test_progress.dart");
-#import("test_suite.dart");
+library test_runner;
+
+import "dart:io";
+import "dart:isolate";
+import "dart:uri";
+import "status_file_parser.dart";
+import "test_progress.dart";
+import "test_suite.dart";
 
 const int NO_TIMEOUT = 0;
 const int SLOW_TIMEOUT_MULTIPLIER = 4;