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..67b711b0e7f7401cb70cf32f2d574553e93c7922 100644
--- a/content/public/test/test_launcher.h
+++ b/content/public/test/test_launcher.h
@@ -64,6 +64,11 @@ class TestLauncherDelegate {
   // when --test-launcher-jobs isn't specified on the command-line.
   virtual void AdjustDefaultParallelJobs(int* default_jobs) {}
 
+  // 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();
+
  protected:
   virtual ~TestLauncherDelegate();
 };