Fixes for -Wunused-function on Linux, Android and ChromeOS

base/files/file_path_watcher_browsertest.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/file_path_watcher.h"
 
 #if defined(OS_WIN)
 #include <windows.h>
 #include <aclapi.h>
 #elif defined(OS_POSIX)
@@ skipping 750 matching lines @@
 }
 
 #endif  // OS_LINUX
 
 enum Permission {
   Read,
   Write,
   Execute
 };
 
+#if defined(OS_MACOSX)
 bool ChangeFilePermissions(const FilePath& path, Permission perm, bool allow) {
-#if defined(OS_POSIX)
   struct stat stat_buf;
 
   if (stat(path.value().c_str(), &stat_buf) != 0)
     return false;
 
   mode_t mode = 0;
   switch (perm) {
     case Read:
       mode = S_IRUSR | S_IRGRP | S_IROTH;
       break;
     case Write:
       mode = S_IWUSR | S_IWGRP | S_IWOTH;
       break;
     case Execute:
       mode = S_IXUSR | S_IXGRP | S_IXOTH;
       break;
     default:
       ADD_FAILURE() << "unknown perm " << perm;
       return false;
   }
   if (allow) {
     stat_buf.st_mode |= mode;
   } else {
     stat_buf.st_mode &= ~mode;
   }
   return chmod(path.value().c_str(), stat_buf.st_mode) == 0;
-
-#elif defined(OS_WIN)
-  PACL old_dacl;
-  PSECURITY_DESCRIPTOR security_descriptor;
-  if (GetNamedSecurityInfo(const_cast<wchar_t*>(path.value().c_str()),
-                           SE_FILE_OBJECT,
-                           DACL_SECURITY_INFORMATION, NULL, NULL, &old_dacl,
-                           NULL, &security_descriptor) != ERROR_SUCCESS)
-    return false;
-
-  DWORD mode = 0;
-  switch (perm) {
-    case Read:
-      mode = GENERIC_READ;
-      break;
-    case Write:
-      mode = GENERIC_WRITE;
-      break;
-    case Execute:
-      mode = GENERIC_EXECUTE;
-      break;
-    default:
-      ADD_FAILURE() << "unknown perm " << perm;
-      return false;
-  }
-
-  // Deny Read access for the current user.
-  EXPLICIT_ACCESS change;
-  change.grfAccessPermissions = mode;
-  change.grfAccessMode = allow ? GRANT_ACCESS : DENY_ACCESS;
-  change.grfInheritance = 0;
-  change.Trustee.pMultipleTrustee = NULL;
-  change.Trustee.MultipleTrusteeOperation = NO_MULTIPLE_TRUSTEE;
-  change.Trustee.TrusteeForm = TRUSTEE_IS_NAME;
-  change.Trustee.TrusteeType = TRUSTEE_IS_USER;
-  change.Trustee.ptstrName = L"CURRENT_USER";
-
-  PACL new_dacl;
-  if (SetEntriesInAcl(1, &change, old_dacl, &new_dacl) != ERROR_SUCCESS) {
-    LocalFree(security_descriptor);
-    return false;
-  }
-
-  DWORD rc = SetNamedSecurityInfo(const_cast<wchar_t*>(path.value().c_str()),
-                                  SE_FILE_OBJECT, DACL_SECURITY_INFORMATION,
-                                  NULL, NULL, new_dacl, NULL);
-  LocalFree(security_descriptor);
-  LocalFree(new_dacl);
-
-  return rc == ERROR_SUCCESS;
-#else
-  NOTIMPLEMENTED();
-  return false;
-#endif
 }
+#endif  // defined(OS_MACOSX)
 
 #if defined(OS_MACOSX)
 // Linux implementation of FilePathWatcher doesn't catch attribute changes.
 // http://crbug.com/78043
 // Windows implementation of FilePathWatcher catches attribute changes that
 // don't affect the path being watched.
 // http://crbug.com/78045
 
 // Verify that changing attributes on a directory works.
 TEST_F(FilePathWatcherTest, DirAttributesChanged) {
@@ skipping 23 matching lines @@
   ASSERT_TRUE(ChangeFilePermissions(test_dir1, Execute, false));
   ASSERT_TRUE(WaitForEvents());
   ASSERT_TRUE(ChangeFilePermissions(test_dir1, Execute, true));
   DeleteDelegateOnFileThread(delegate.release());
 }
 
 #endif  // OS_MACOSX
 }  // namespace
 
 }  // namespace base