Update from https://crrev.com/306655

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 <stdio.h>
 #include <sys/stat.h>
@@ skipping 39 matching lines @@
 
 // Give dynamic tools a simple thing to test.
 TEST(Credentials, CreateAndDestroy) {
   {
     Credentials cred1;
     (void) cred1;
   }
   scoped_ptr<Credentials> cred2(new Credentials);
 }
 
-TEST(Credentials, CountOpenFds) {
-  base::ScopedFD proc_fd(open("/proc", O_RDONLY | O_DIRECTORY));
-  ASSERT_TRUE(proc_fd.is_valid());
-  Credentials creds;
-  int fd_count = creds.CountOpenFds(proc_fd.get());
-  int fd = open("/dev/null", O_RDONLY);
-  ASSERT_LE(0, fd);
-  EXPECT_EQ(fd_count + 1, creds.CountOpenFds(proc_fd.get()));
-  ASSERT_EQ(0, IGNORE_EINTR(close(fd)));
-  EXPECT_EQ(fd_count, creds.CountOpenFds(proc_fd.get()));
-}
-
-TEST(Credentials, HasOpenDirectory) {
-  Credentials creds;
-  // No open directory should exist at startup.
-  EXPECT_FALSE(creds.HasOpenDirectory(-1));
-  {
-    // Have a "/dev" file descriptor around.
-    int dev_fd = open("/dev", O_RDONLY | O_DIRECTORY);
-    base::ScopedFD dev_fd_closer(dev_fd);
-    EXPECT_TRUE(creds.HasOpenDirectory(-1));
-  }
-  EXPECT_FALSE(creds.HasOpenDirectory(-1));
-}
-
-TEST(Credentials, HasOpenDirectoryWithFD) {
-  Credentials creds;
-
-  int proc_fd = open("/proc", O_RDONLY | O_DIRECTORY);
-  base::ScopedFD proc_fd_closer(proc_fd);
-  ASSERT_LE(0, proc_fd);
-
-  // Don't pass |proc_fd|, an open directory (proc_fd) should
-  // be detected.
-  EXPECT_TRUE(creds.HasOpenDirectory(-1));
-  // Pass |proc_fd| and no open directory should be detected.
-  EXPECT_FALSE(creds.HasOpenDirectory(proc_fd));
-
-  {
-    // Have a "/dev" file descriptor around.
-    int dev_fd = open("/dev", O_RDONLY | O_DIRECTORY);
-    base::ScopedFD dev_fd_closer(dev_fd);
-    EXPECT_TRUE(creds.HasOpenDirectory(proc_fd));
-  }
-
-  // The "/dev" file descriptor should now be closed, |proc_fd| is the only
-  // directory file descriptor open.
-  EXPECT_FALSE(creds.HasOpenDirectory(proc_fd));
-}
-
 SANDBOX_TEST(Credentials, DropAllCaps) {
   Credentials creds;
   CHECK(creds.DropAllCapabilities());
   CHECK(!creds.HasAnyCapability());
 }
 
 SANDBOX_TEST(Credentials, GetCurrentCapString) {
   Credentials creds;
   CHECK(creds.DropAllCapabilities());
   const char kNoCapabilityText[] = "=";
@@ skipping 107 matching lines @@
 
   // The kernel should now prevent us from regaining capabilities because we
   // are in a chroot.
   CHECK(!Credentials::SupportsNewUserNS());
   CHECK(!creds.MoveToNewUserNS());
 }
 
 }  // namespace.
 
 }  // namespace sandbox.