[malemotion] Remove the extractor

Announcement from their homepage:

```
MaleMotion is closed

After another system crash, I'm forced to close the site

This week all content will be erased

Don't forget to cancel your subscription if any !
```

Closes #9311.

youtube_dl/extractor/extractors.py

@@ -400,7 +400,6 @@
 from .mailru import MailRuIE
 from .makerschannel import MakersChannelIE
 from .makertv import MakerTVIE
-from .malemotion import MalemotionIE
 from .matchtv import MatchTVIE
 from .mdr import MDRIE
 from .metacafe import MetacafeIE

youtube_dl/extractor/malemotion.py

@@ -1,46 +0,0 @@
-# coding: utf-8
-from __future__ import unicode_literals
-
-from .common import InfoExtractor
-from ..compat import compat_urllib_parse_unquote
-
-
-class MalemotionIE(InfoExtractor):
-    _VALID_URL = r'https?://malemotion\.com/video/(.+?)\.(?P<id>.+?)(#|$)'
-    _TEST = {
-        'url': 'http://malemotion.com/video/bete-de-concours.ltc',
-        'md5': '3013e53a0afbde2878bc39998c33e8a5',
-        'info_dict': {
-            'id': 'ltc',
-            'ext': 'mp4',
-            'title': 'Bête de Concours',
-            'age_limit': 18,
-        },
-    }
-
-    def _real_extract(self, url):
-        video_id = self._match_id(url)
-        webpage = self._download_webpage(url, video_id)
-
-        video_url = compat_urllib_parse_unquote(self._search_regex(
-            r'<source type="video/mp4" src="(.+?)"', webpage, 'video URL'))
-        video_title = self._html_search_regex(
-            r'<title>(.*?)</title', webpage, 'title')
-        video_thumbnail = self._search_regex(
-            r'<video .+?poster="(.+?)"', webpage, 'thumbnail', fatal=False)
-
-        formats = [{
-            'url': video_url,
-            'ext': 'mp4',
-            'format_id': 'mp4',
-            'preference': 1,
-        }]
-        self._sort_formats(formats)
-
-        return {
-            'id': video_id,
-            'formats': formats,
-            'title': video_title,
-            'thumbnail': video_thumbnail,
-            'age_limit': 18,
-        }