Updates to base unittests so they run correctly in libchrome on Android

base/files/dir_reader_posix_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 "base/files/dir_reader_posix.h"
 
 #include <fcntl.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
+#include "base/files/scoped_temp_dir.h"
 #include "base/logging.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
 #if defined(OS_ANDROID)
 #include "base/os_compat_android.h"
 #endif
 
 namespace base {
 
 TEST(DirReaderPosixUnittest, Read) {
   static const unsigned kNumFiles = 100;
 
   if (DirReaderPosix::IsFallback())
     return;
 
-  char kDirTemplate[] = "/tmp/org.chromium.dir-reader-posix-XXXXXX";
-  const char* dir = mkdtemp(kDirTemplate);
+  base::ScopedTempDir temp_dir;
+  ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
+  const char* dir = temp_dir.path().value().c_str();
   ASSERT_TRUE(dir);
 
   const int prev_wd = open(".", O_RDONLY | O_DIRECTORY);
   DCHECK_GE(prev_wd, 0);
 
   PCHECK(chdir(dir) == 0);
 
   for (unsigned i = 0; i < kNumFiles; i++) {
     char buf[16];
     snprintf(buf, sizeof(buf), "%d", i);
@@ skipping 43 matching lines @@
 
   PCHECK(fchdir(prev_wd) == 0);
   PCHECK(close(prev_wd) == 0);
 
   EXPECT_TRUE(seen_dot);
   EXPECT_TRUE(seen_dotdot);
   EXPECT_EQ(kNumFiles, seen.size());
 }
 
 }  // namespace base