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

base/task_scheduler/priority_queue_unittest.cc

 // Copyright 2016 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/task_scheduler/priority_queue.h"
 
 #include <memory>
 
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
@@ skipping 120 matching lines @@
 TEST(TaskSchedulerPriorityQueueTest, IllegalTwoTransactionsSameThread) {
   PriorityQueue pq_a;
   PriorityQueue pq_b;
 
   EXPECT_DCHECK_DEATH(
       {
         std::unique_ptr<PriorityQueue::Transaction> transaction_a =
             pq_a.BeginTransaction();
         std::unique_ptr<PriorityQueue::Transaction> transaction_b =
             pq_b.BeginTransaction();
-      },
-      "");
+      });
 }
 
 // Check that there is no crash when Transactions are created on the same thread
 // for 2 PriorityQueues which have a predecessor relationship.
 TEST(TaskSchedulerPriorityQueueTest, LegalTwoTransactionsSameThread) {
   PriorityQueue pq_a;
   PriorityQueue pq_b(&pq_a);
 
   // This shouldn't crash.
   std::unique_ptr<PriorityQueue::Transaction> transaction_a =
@@ skipping 23 matching lines @@
 
   // End the Transaction on the current thread.
   transaction.reset();
 
   // The other thread should exit after its call to BeginTransaction() returns.
   thread_beginning_transaction.Join();
 }
 
 }  // namespace internal
 }  // namespace base