Google Toolbar which currently available only for Internet Explorer installs Chrome frame too. Google Chrome Frame, a plug-in for Internet Explorer developed by Google to bring Chrome engine to IE, which allows Google services and other websites/apps built on modern technologies like HTML5 to run inside. Chrome Frame supports IE 6, 7, 8 and 9 versions. This plugin doesn’t only ports Chrome rendering engine but also brings Chrome performance and security features into Microsoft browser.
Remember! Google to end Google Apps support for IE 8 by November this year which also makes organizations and wed developers using IE 6/7/8/9 to keep using Chrome Frame to use Google apps
Disable or Uninstall Chrome Frame
Latest version of Google Toolbar installs Chrome frame also with it. To check if Chrome Frame is installed, right click on any page and check for Chrome frame menu item or know about the same by typing gcf:about:version in address bar.
Currently there is no way to opt-out of this however you can disable Chrome Frame. For this, from IE Tools menu select Manage Add-ons, select Toolbars and Extensions find ChromeFrameBHO and click on disable button at the bottom.
You can uninstall Chrome Frame from Add/Remove programs or Programs and features in Control Panel. [Via GOS]
What do you say about Chrome Frame being installed with Google Toolbar?