If you’ve been used to the behaviour of the old space bar, you can get it back with a flag. As usual, there’s no guarantee that these Chrome flags will stick around.

• To really get started, open the Chrome flag page. 
• Type “chrome:/flags” (without quotes) in the Chrome location bar and press Enter to find it.
• Type “omnibox keyword” in the search box at the top of the page.

• So, when “Omnibox keyword search button” option appears
• click the “Default” box and set the “Disabled” option.
• type “omnibox suggestion” in the search field.
• Whenever the option “Omnibox suggestion button row” appears, click the “Default” box to the right and set the option to “Enabled.”

• You’re done now, and you can click the “Relaunch” button at the bottom of the page to restart Google Chrome.

• Once it restarts, you’ll be ready to be using the Space bar again with your custom searches.