base: Remove the string logging from CHECK().

sandbox/linux/services/credentials_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 "sandbox/linux/services/credentials.h"
 
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
 #include <pthread.h>
@@ skipping 112 matching lines @@
 }
 
 SANDBOX_TEST(Credentials, NestedUserNS) {
   CHECK(Credentials::DropAllCapabilities());
   // Probably missing kernel support.
   if (!Credentials::MoveToNewUserNS()) return;
   CHECK(Credentials::DropAllCapabilities());
   // As of 3.12, the kernel has a limit of 32. See create_user_ns().
   const int kNestLevel = 10;
   for (int i = 0; i < kNestLevel; ++i) {
-    CHECK(NewUserNSCycle()) << "Creating new user NS failed at iteration "
-                                  << i << ".";
+    // Creating new user NS failed at iteration |i|.
+    CHECK(NewUserNSCycle());
   }
 }
 
 // Test the WorkingDirectoryIsRoot() helper.
 SANDBOX_TEST(Credentials, CanDetectRoot) {
   PCHECK(0 == chdir("/proc/"));
   CHECK(!WorkingDirectoryIsRoot());
   PCHECK(0 == chdir("/"));
   CHECK(WorkingDirectoryIsRoot());
 }
@@ skipping 118 matching lines @@
   action.sa_handler = &SignalHandler;
   PCHECK(sigaction(SIGUSR1, &action, nullptr) == 0);
 
   PCHECK(raise(SIGUSR1) == 0);
   CHECK_EQ(1, signal_handler_called);
 }
 
 }  // namespace.
 
 }  // namespace sandbox.