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

base/threading/simple_thread_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 <memory>
 
 #include "base/atomic_sequence_num.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/test/gtest_util.h"
@@ skipping 135 matching lines @@
             std::string("event_waiter/") + IntToString(thread.tid()));
 }
 
 TEST(SimpleThreadTest, JoinNonJoinableThreadDeath) {
   SleepRunner runner;
   SimpleThread::Options options;
   options.joinable = false;
   DelegateSimpleThread thread(&runner, "noop_runner", options);
 
   thread.Start();
-  EXPECT_DCHECK_DEATH(thread.Join(), "");
+  EXPECT_DCHECK_DEATH(thread.Join());
 }
 
 TEST(SimpleThreadTest, DeleteNonJoinableWithoutJoinIsSafe) {
   SleepRunner runner;
   SimpleThread::Options options;
   options.joinable = false;
   DelegateSimpleThread thread(&runner, "noop_runner", options);
   thread.Start();
   // Nothing blows up when |thread| goes out of scope.
 }
@@ skipping 25 matching lines @@
   VerifyPoolRunner verifier(&seq2, 9, &event);
   pool.Start();
 
   pool.AddWork(&verifier, 10);
 
   pool.JoinAll();
   EXPECT_EQ(seq2.GetNext(), 10);
 }
 
 }  // namespace base