Recent Naver geo-restriction in youtube-dl. Works in Firefox.

[BlackHoleSpain]

• I've verified and I assure that I'm running youtube-dl 2018.03.26.1
• Searched the bugtracker for similar issues including closed ones
• Checked that provided video/audio/playlist URLs (if any) are alive and playable in a browser
• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)

[debug] System config: []
[debug] User config: []
[debug] Custom config: []
[debug] Command-line args: ['http://tv.naver.com/v/2915119', '-v']
[debug] Encodings: locale cp1252, fs mbcs, out cp850, pref cp1252
[debug] youtube-dl version 2018.03.26.1
[debug] Python version 3.4.4 (CPython) - Windows-7-6.1.7601-SP1
[debug] exe versions: ffmpeg 3.4, ffprobe 1.2, rtmpdump 2.4
[debug] Proxy map: {}
[Naver] 2915119: Downloading webpage
ERROR: According to the request of the right holder,
the clip is not available in your country.
Traceback (most recent call last):
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmph9lcnopy\bu
ild\youtube_dl\YoutubeDL.py", line 785, in extract_info
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmph9lcnopy\bu
ild\youtube_dl\extractor\common.py", line 440, in extract
  File "C:\Users\dst\AppData\Roaming\Build archive\youtube-dl\rg3\tmph9lcnopy\bu
ild\youtube_dl\extractor\naver.py", line 53, in _real_extract
youtube_dl.utils.ExtractorError: According to the request of the right holder,
the clip is not available in your country.

I have been using yt-dl for years, however 2 days ago started failing with NAVER.COM site, giving a geo-restriction message. I have tried a lot of anonymous and distorting proxies in Korea, and I get the same error in Korean language, as if the site was able to detect the tool.

The strange thing in all this, is that the videos work perfectly in Firefox and Chrome from an IP outside the country. However, the data is served in chunks from a m3u8 list instead.

• Single video: http://tv.naver.com/v/2939125