Refactor MainHook into TestSuite.

ui/test/run_all_unittests.cc

Index: ui/test/run_all_unittests.cc
diff --git a/ui/test/run_all_unittests.cc b/ui/test/run_all_unittests.cc
index e2efa31c3779be23eafec4eb16ed977f6b14b7f0..13ed8d6b0440c4fec42916423cb3174fbd937224 100644
--- a/ui/test/run_all_unittests.cc
+++ b/ui/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 "ui/test/test_suite.h"
 
 int main(int argc, char** argv) {
-  MainHook hook(main, argc, argv);
   return ui::test::UITestSuite(argc, argv).Run();
 }