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This works for me:

For Sublime Text 3 for OS X, you need to extract JavaScript.tmLanguage file first:
cp /Applications/Sublime\ /tmp/
unzip /tmp/ -d /tmp/JavaScript
cp /tmp/JavaScript/JavaScript.tmLanguage ~/Library/Application\ Support/Sublime\ Text\ 3/Packages/JavaScript/JavaScript.tmLanguage
open ~/Library/Application\ Support/Sublime\ Text\ 3/Packages/JavaScript/
Then edit JavaScript.tmLanguage file as the post said (in line 650):
Save the file, there should be an immediate effect on the opened JavaScript files.