As of today this is built-in functionality within Chrome GTK/Linux only. Here is the key thread discussing the change: https://code.google.com/p/chromium/issues/detail?id=1316
Windows users must use Chrome Toolbox (by Google) or an alternate solution. Unfortunately this extension and its control options aren't available on Chrome Linux's latest versions due to the drop for NPAPI support, as mentioned in the extension FAQ.
As a result, the only option I see is to pull down the source code for Chrome and modify the source, which I've done personally to make tweaks. It's not that hard to do and would be the route I would take. For this particular feature, I would simply undo / rollback the following change and recompile:
If you click the "View" link under the column Side-by-side diffs and change the files to match the red version (old), that should essentially do the trick. Sorry this is technical in nature, but it would certainly solve the problem. Alternative suggestions welcome.