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

base/message_loop/message_pump_io_ios_unittest.cc

 // Copyright 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/message_loop/message_pump_io_ios.h"
 
 #include <unistd.h>
 
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
@@ skipping 64 matching lines @@
 
 // Test to make sure that we catch calling WatchFileDescriptor off of the wrong
 // thread.
 TEST_F(MessagePumpIOSForIOTest, TestWatchingFromBadThread) {
   MessagePumpIOSForIO::FileDescriptorWatcher watcher;
   StupidWatcher delegate;
 
   ASSERT_DCHECK_DEATH(
       io_loop()->WatchFileDescriptor(STDOUT_FILENO, false,
                                      MessageLoopForIO::WATCH_READ, &watcher,
-                                     &delegate),
-      "Check failed: "
-      "watch_file_descriptor_caller_checker_.CalledOnValidThread\\(\\)");
+                                     &delegate));
 }
 
 class BaseWatcher : public MessagePumpIOSForIO::Watcher {
  public:
   BaseWatcher(MessagePumpIOSForIO::FileDescriptorWatcher* controller)
       : controller_(controller) {
     DCHECK(controller_);
   }
   ~BaseWatcher() override {}
 
@@ skipping 75 matching lines @@
   pump->WatchFileDescriptor(pipefds_[1],
       false, MessagePumpIOSForIO::WATCH_READ_WRITE, &watcher, &delegate);
 
   // Spoof a callback.
   HandleFdIOEvent(&watcher);
 }
 
 }  // namespace
 
 }  // namespace base