Refactor MainHook into TestSuite.

base/test/run_all_unittests.cc

Index: base/test/run_all_unittests.cc
diff --git a/base/test/run_all_unittests.cc b/base/test/run_all_unittests.cc
index 969b09164a448748188871fffb684a98791dc74d..2c8d29c6d00885e8e8c27f74a105e94cb5c96fa4 100644
--- a/base/test/run_all_unittests.cc
+++ b/base/test/run_all_unittests.cc
@@ -2,10 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "base/test/main_hook.h"
 #include "base/test/test_suite.h"
 
 int main(int argc, char** argv) {
-  MainHook hook(main, argc, argv);
   return base::TestSuite(argc, argv).Run();
 }