Dart: Remove shutdown workarounds.

services/dart/content_handler_main.cc

Index: services/dart/content_handler_main.cc
diff --git a/services/dart/content_handler_main.cc b/services/dart/content_handler_main.cc
index ed05a806078db63df847ca1ae1e11031126e354f..4d73d83ffad1abda22cdad712ec2f714d3c4446c 100644
--- a/services/dart/content_handler_main.cc
+++ b/services/dart/content_handler_main.cc
@@ -247,8 +247,5 @@ DartContentHandler::CreateApplication(
 
 MojoResult MojoMain(MojoHandle application_request) {
   mojo::ApplicationRunnerChromium runner(new dart::DartContentHandlerApp);
-  MojoResult r = runner.Run(application_request);
-  // TODO(johnmccutchan): Remove this once the Dart VM shuts down threads.
-  base::PlatformThread::Sleep(base::TimeDelta::FromMilliseconds(100));
-  return r;
+  return runner.Run(application_request);
 }