Merge watchlistloader into host since it's an unnecessary indirection
https://bugs.webkit.org/show_bug.cgi?id=114555

Reviewed by Antti Koivisto.

We don't need a class to load a file.

* Scripts/webkitpy/common/host.py:
(Host.watch_list):
* Scripts/webkitpy/common/watchlist/watchlistloader.py: Removed.
* Scripts/webkitpy/common/watchlist/watchlistloader_unittest.py: Removed.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148354 268f45cc-cd09-0410-ab3c-d52691b4dbfc