Remove stale method ViewFileSystem#getTrashCanLocation

ViewFileSystem which extends FileSystem has a public method getTrashCanLocation which is neither overridden nor used by anybody. Looks like it existed when the file was created, and also I see the implementation returning homeDirectory which might not be the expected one in cases of expunge. So, inclined to remove this stale and potentially dangerous method unless anyone has any concerns.

  public Path getTrashCanLocation(final Path f) throws FileNotFoundException {
    final InodeTree.ResolveResult<FileSystem> res = 
      fsState.resolve(getUriPath(f), true);
    return res.isInternalDir() ? null : res.targetFileSystem.getHomeDirectory();
  }