[NaCl SDK] nacl_io: Fix utime() on directories.

native_client_sdk/src/tests/nacl_io_test/filesystem_test.cc

 // Copyright 2013 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 <errno.h>
 #include <fcntl.h>
 #include <string.h>
 #include <sys/stat.h>
 #include <string>
 
@@ skipping 59 matching lines @@
   // one returned to the test, one for the name->inode map.
   ASSERT_EQ(2, fs.num_nodes());
   ASSERT_EQ(2, file->RefCount());
   ASSERT_EQ(0, file->GetStat(&buf));
   ASSERT_EQ(0, buf.st_mode & S_IXUSR);
 
   // All access should be allowed on the root directory.
   EXPECT_EQ(0, fs.Open(Path("/"), O_RDONLY, &root));
   ASSERT_EQ(0, root->GetStat(&buf));
   ASSERT_EQ(S_IRWXU, buf.st_mode & S_IRWXU);
-  // Opening a directory for write should fail.
-  EXPECT_EQ(EISDIR, fs.Open(Path("/"), O_RDWR, &root));
-  EXPECT_EQ(2, fs.num_nodes());
 
   // Open the root directory, should not create a new file
   EXPECT_EQ(0, fs.Open(Path("/"), O_RDONLY, &root));
   EXPECT_EQ(2, fs.num_nodes());
   ASSERT_NE(NULL_NODE, root.get());
   struct dirent dirs[4];
   int len;
   EXPECT_EQ(0, root->GetDents(0, dirs, sizeof(dirs), &len));
   // 3 == "foo", ".", ".."
   EXPECT_EQ(3 * sizeof(struct dirent), len);
@@ skipping 304 matching lines @@
   double expected_count = kTotalSamples / 256.;
   double chi_squared = 0;
   for (int i = 0; i < 256; ++i) {
     double difference = byte_count[i] - expected_count;
     chi_squared += difference * difference / expected_count;
   }
 
   // Approximate chi-squared value for p-value 0.05, 255 degrees-of-freedom.
   EXPECT_LE(chi_squared, 293.24);
 }