Changes to get mash browser_tests shutdown working correctly

content/public/test/test_launcher.h

Index: content/public/test/test_launcher.h
diff --git a/content/public/test/test_launcher.h b/content/public/test/test_launcher.h
index 117c65866ba967afb9489b7d9a96eeb07be93a04..b6a9f7063ec0453493196e0f251ca46eee258614 100644
--- a/content/public/test/test_launcher.h
+++ b/content/public/test/test_launcher.h
@@ -50,6 +50,11 @@ class TestLauncherDelegate {
   virtual void PostRunMessageLoop() {}
   virtual ContentMainDelegate* CreateContentMainDelegate() = 0;
 
+  // Called prior to returning from LaunchTests(). Gives the delegate a chance
+  // to do cleanup before state created by TestLauncher has been destroyed (such
+  // as the AtExitManager).
+  virtual void OnDoneRunningTests();

[jam, 2016/03/23 15:12:16]

nit: move this to the end (after line 70) so that the function order matches the
order they're called in?

+
   // Called prior to running each test. The delegate may alter the CommandLine
   // and options used to launch the subprocess. Additionally the client may
   // return a TestState that is destroyed once the test completes as well as