Mobile site in Chrome logs errors about viewport

When the English mobile site is opened in Chrome, the following errors are logged in the Javascript console:

Viewport argument value "320;" for key "width" was truncated to its numeric prefix. Note that ';' is not a separator in viewport values. The list should be comma-separated. popular:5
Viewport argument value "0;" for key "user-scalable" was truncated to its numeric prefix. Note that ';' is not a separator in viewport values. The list should be comma-separated.

Steps to reproduce:
1. use Chrome
2. open the Javascript console (F12 -> Console)
3. open the English mobile site (http://localhost:8080/site/mobile)

Expected: no errors logged
Actual: the errors mentioned above are logged