Don't use base::MessageLoop::{Quit,QuitClosure} in content/

content/shell/browser/layout_test/layout_test_browser_main.cc

Index: content/shell/browser/layout_test/layout_test_browser_main.cc
diff --git a/content/shell/browser/layout_test/layout_test_browser_main.cc b/content/shell/browser/layout_test/layout_test_browser_main.cc
index c8c73cc086843152d1d42c091ceac6bff31be256..3bad74bf171df950d859462e80d990b052238600 100644
--- a/content/shell/browser/layout_test/layout_test_browser_main.cc
+++ b/content/shell/browser/layout_test/layout_test_browser_main.cc
@@ -89,7 +89,7 @@ int RunTests(const scoped_ptr<content::BrowserMainRunner>& main_runner) {
   }
   if (!ran_at_least_once) {
     base::ThreadTaskRunnerHandle::Get()->PostTask(
-        FROM_HERE, base::MessageLoop::QuitClosure());
+        FROM_HERE, base::MessageLoop::QuitWhenIdleClosure());
     main_runner->Run();
   }
 
@@ -131,7 +131,7 @@ int LayoutTestBrowserMain(
   if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kCheckLayoutTestSysDeps)) {
     base::ThreadTaskRunnerHandle::Get()->PostTask(
-        FROM_HERE, base::MessageLoop::QuitClosure());
+        FROM_HERE, base::MessageLoop::QuitWhenIdleClosure());
     main_runner->Run();
     content::Shell::CloseAllWindows();
     main_runner->Shutdown();