Do some housekeeping in tools/testing/dart

tools/testing/dart/utils.dart

Index: tools/testing/dart/utils.dart
diff --git a/tools/testing/dart/utils.dart b/tools/testing/dart/utils.dart
index fd2245e1986f21c8fc6f9bfa1525e4655c759ee5..28eccbe349f53428689015dac7e817f2faaf17b0 100644
--- a/tools/testing/dart/utils.dart
+++ b/tools/testing/dart/utils.dart
@@ -14,9 +14,9 @@ import 'path.dart';
 const Duration MAX_STDIO_DELAY = const Duration(seconds: 30);
 
 String MAX_STDIO_DELAY_PASSED_MESSAGE =
-    """Not waiting for stdout/stderr from subprocess anymore 
-($MAX_STDIO_DELAY passed). Please note that this could be an indicator 
-that there is a hanging process which we were unable to kill.""";
+    """Not waiting for stdout/stderr from subprocess anymore
+ ($MAX_STDIO_DELAY passed). Please note that this could be an indicator
+ that there is a hanging process which we were unable to kill.""";
 
 class DebugLogger {
   static IOSink _sink;