Add .desktop file to download_file_types.asciipb

.desktop files act as shortcuts on Linux, allowing arbitrary code
execution. We should send pings for these files.

Bug: 904182
Change-Id: Ibc26141fb180e843e1ffaf3f78717a9109d2fa9a
Reviewed-on: https://chromium-review.googlesource.com/c/1344552
Reviewed-by: Varun Khaneja <vakh@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611272}
void RecordDangerousDownloadAccept(DownloadDangerType danger_type,
                                   const base::FilePath& file_path) {
  UMA_HISTOGRAM_ENUMERATION("Download.DangerousDownloadValidated", danger_type,
                            DOWNLOAD_DANGER_TYPE_MAX);
  if (danger_type == DOWNLOAD_DANGER_TYPE_DANGEROUS_FILE) {
    base::UmaHistogramSparse(
        "Download.DangerousFile.DangerousDownloadValidated",
        GetDangerousFileType(file_path));
  }
}

void RecordDangerousDownloadAccept(DownloadDangerType danger_type,
                                   const base::FilePath& file_path) {
  UMA_HISTOGRAM_ENUMERATION("Download.DangerousDownloadValidated", danger_type,
                            DOWNLOAD_DANGER_TYPE_MAX);
  if (danger_type == DOWNLOAD_DANGER_TYPE_DANGEROUS_FILE) {
    base::UmaHistogramSparse(
        "Download.DangerousFile.DangerousDownloadValidated",
        GetDangerousFileType(file_path));
  }
}
