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

base/synchronization/atomic_flag_unittest.cc

 // Copyright (c) 2011 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/synchronization/atomic_flag.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
 #include "base/synchronization/waitable_event.h"
 #include "base/test/gtest_util.h"
 #include "base/threading/platform_thread.h"
 #include "base/threading/thread.h"
 #include "build/build_config.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 namespace base {
 
 namespace {
 
 void ExpectSetFlagDeath(AtomicFlag* flag) {
   ASSERT_TRUE(flag);
-  EXPECT_DCHECK_DEATH(flag->Set(), "");
+  EXPECT_DCHECK_DEATH(flag->Set());
 }
 
 // Busy waits (to explicitly avoid using synchronization constructs that would
 // defeat the purpose of testing atomics) until |tested_flag| is set and then
 // verifies that non-atomic |*expected_after_flag| is true and sets |*done_flag|
 // before returning if it's non-null.
 void BusyWaitUntilFlagIsSet(AtomicFlag* tested_flag, bool* expected_after_flag,
                             AtomicFlag* done_flag) {
   while (!tested_flag->IsSet())
     PlatformThread::YieldCurrentThread();
@@ skipping 88 matching lines @@
   Thread t("AtomicFlagTest.SetOnDifferentThreadDeathTest");
   ASSERT_TRUE(t.Start());
   EXPECT_TRUE(t.WaitUntilThreadStarted());
 
   AtomicFlag flag;
   flag.Set();
   t.task_runner()->PostTask(FROM_HERE, Bind(&ExpectSetFlagDeath, &flag));
 }
 
 }  // namespace base