In a plan outlined last week, Flash will be disabled by default in the fourth quarter of this year. Embedded Flash content will not run, and JavaScript attempts to detect the plugin will not find it. Whenever Chrome detects that a site is trying to use the plugin, it will ask the user if they want to enable it or not. It will also trap attempts to redirect users to Adobe’s Flash download page and similarly offer to enable the plugin.

Source: HTML5 by default: Google’s plan to make Chrome’s Flash click-to-play