For unit tests, track additions to AtExitManager and warn.

chrome/test/base/in_process_browser_test.cc

Index: chrome/test/base/in_process_browser_test.cc
diff --git a/chrome/test/base/in_process_browser_test.cc b/chrome/test/base/in_process_browser_test.cc
index a65d00cbe3f998e07e2bcc8c73ca59141bf3ab76..a3360798fd2b03b19e5c4b8df8f6d977f13f91f0 100644
--- a/chrome/test/base/in_process_browser_test.cc
+++ b/chrome/test/base/in_process_browser_test.cc
@@ -13,6 +13,7 @@
 #include "base/path_service.h"
 #include "base/string_number_conversions.h"
 #include "base/test/test_file_util.h"
+#include "base/test/test_switches.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/io_thread.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
@@ -297,8 +298,8 @@ CommandLine InProcessBrowserTest::GetCommandLineForRelaunch() {
   CommandLine::SwitchMap switches =
       CommandLine::ForCurrentProcess()->GetSwitches();
   switches.erase(switches::kUserDataDir);
-  switches.erase(test_launcher::kSingleProcessTestsFlag);
-  switches.erase(test_launcher::kSingleProcessTestsAndChromeFlag);
+  switches.erase(switches::kSingleProcessTestsFlag);
+  switches.erase(switches::kSingleProcessTestsAndChromeFlag);
   new_command_line.AppendSwitch(ChromeTestSuite::kLaunchAsBrowser);
 
 #if defined(USE_AURA)