Visit the Old New Tab on the Chrome Web Store and choose "Add to Chrome".
git clone this repo. Go to Chrome Settings > Extensions (chrome://extensions). Choose "Load unpacked extension" and choose the unpacked-extension folder in this repo. Disable the extension to switch back to the original Chrome New Tab page.
Based on adamschwartz's chrome-new-tab, which was in turn based on tech-no-crat's chrome-newtab-minimalism.