Change EXPECT/ASSERT_DCHECK_DEATH macro to not expose the |regex| parameter.

base/threading/thread_checker_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "base/threading/thread_checker.h"
 
 #include <memory>
 
 #include "base/logging.h"
 #include "base/macros.h"
@@ skipping 107 matching lines @@
   // DoStuff should assert in debug builds only when called on a
   // different thread.
   CallDoStuffOnThread call_on_thread(thread_checker_class.get());
 
   call_on_thread.Start();
   call_on_thread.Join();
 }
 
 #if DCHECK_IS_ON()
 TEST(ThreadCheckerDeathTest, MethodNotAllowedOnDifferentThreadInDebug) {
-  ASSERT_DCHECK_DEATH({ ThreadCheckerClass::MethodOnDifferentThreadImpl(); },
-                      "");
+  ASSERT_DCHECK_DEATH({ ThreadCheckerClass::MethodOnDifferentThreadImpl(); });
 }
 #else
 TEST(ThreadCheckerTest, MethodAllowedOnDifferentThreadInRelease) {
   ThreadCheckerClass::MethodOnDifferentThreadImpl();
 }
 #endif  // DCHECK_IS_ON()
 
 void ThreadCheckerClass::DetachThenCallFromDifferentThreadImpl() {
   std::unique_ptr<ThreadCheckerClass> thread_checker_class(
       new ThreadCheckerClass);
 
   // DoStuff doesn't assert when called on a different thread
   // after a call to DetachFromThread.
   thread_checker_class->DetachFromThread();
   CallDoStuffOnThread call_on_thread(thread_checker_class.get());
 
   call_on_thread.Start();
   call_on_thread.Join();
 
   // DoStuff should assert in debug builds only after moving to
   // another thread.
   thread_checker_class->DoStuff();
 }
 
 #if DCHECK_IS_ON()
 TEST(ThreadCheckerDeathTest, DetachFromThreadInDebug) {
   ASSERT_DCHECK_DEATH(
-      { ThreadCheckerClass::DetachThenCallFromDifferentThreadImpl(); }, "");
+      { ThreadCheckerClass::DetachThenCallFromDifferentThreadImpl(); });
 }
 #else
 TEST(ThreadCheckerTest, DetachFromThreadInRelease) {
   ThreadCheckerClass::DetachThenCallFromDifferentThreadImpl();
 }
 #endif  // DCHECK_IS_ON()
 
 }  // namespace base