If you get to a state when Chrome says Whoa just after you run it and you believe that this might be caused by some extension, and there's no way to get to the chrome://extensions/ to disable it, then here's how to uninstall an extension in emergency mode:

• Locate the file C:\Documents and Settings\<User>\Local settings\Application data\Google\Chrome\User Data\Default\Preferences, open it for editing.
• Find the section that describes the extension that you want to diable. It will start with the extension's id (for example "cciomicmolmofdcijoabgmccejjbacgg"). Identify the extension you want to uninstall by some data present in the block, like the name or description.
• Delete the whole section of the extension (usually around twenty lines). Make sure you also delete the comma after the previous section if it now becomes the last one (trailing comma before } is not allowed).
• Save changes and run Chrome.

If you find that some extension really causes this behaviour, please fill an issue about this.