Remove android_java_ui as it is not used

chrome/browser/download/download_path_reservation_tracker.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 "chrome/browser/download/download_path_reservation_tracker.h"
 
 #include <stddef.h>
 
 #include <map>
 
@@ skipping 185 matching lines @@
       (create_directory ||
        (!default_download_path.empty() &&
         (default_download_path == target_dir)))) {
     base::CreateDirectory(target_dir);
   }
 
   // Check writability of the suggested path. If we can't write to it, default
   // to the user's "My Documents" directory. We'll prompt them in this case.
   if (!base::PathIsWritable(target_dir)) {
     DVLOG(1) << "Unable to write to directory \"" << target_dir.value() << "\"";
-#if BUILDFLAG(ANDROID_JAVA_UI)
+#if defined(OS_ANDROID)
     // On Android, DIR_USER_DOCUMENTS is in reality a subdirectory
     // of DIR_ANDROID_APP_DATA which isn't accessible by other apps.
     reserved_path->clear();
     (*g_reservation_map)[key] = *reserved_path;
     return false;
 #else
     is_path_writeable = false;
     PathService::Get(chrome::DIR_USER_DOCUMENTS, &target_dir);
     target_path = target_dir.Append(filename);
-#endif  // BUILDFLAG(ANDROID_JAVA_UI)
+#endif  // defined(OS_ANDROID)
   }
 
   if (is_path_writeable) {
     // Check the limit of file name length if it could be obtained. When the
     // suggested name exceeds the limit, truncate or prompt the user.
     int max_length = base::GetMaximumPathComponentLength(target_dir);
     if (max_length != -1) {
       int limit = max_length - kIntermediateNameSuffixLength;
       if (limit <= 0 || !TruncateFileName(&target_path, limit))
         name_too_long = true;
@@ skipping 171 matching lines @@
       base::Bind(&RunGetReservedPathCallback,
                  callback,
                  base::Owned(reserved_path)));
 }
 
 // static
 bool DownloadPathReservationTracker::IsPathInUseForTesting(
     const base::FilePath& path) {
   return IsPathInUse(path);
 }