LaTeX-cwl is a Sublime Text plugin and used by the LaTeX plugin LaTeXing. The plugin supplies cwl files which are used for the autocompletion of LaTeX commands.
Packages/LaTeX-cwl
directory, then relaunch Sublime:
~/.config/sublime-text-2|3/Packages/LaTeX-cwl
~/Library/Application Support/Sublime Text 2|3/Packages/LaTeX-cwl
%APPDATA%/Sublime Text 2|3/Packages/LaTeX-cwl