Disable Google Chrome Keyboard Shortcuts

I have a couple of Web sites that have conflicting keyboard assignments with Google Chrome. For example, there are sites where Ctrl+Shift+B (or Command+Shift+B on Mac) is a shortcut for Bold or Bullet, but this combination is already used by Chrome to toggle the visibility of the bookmarks toolbar.

The question is simply: how do I disable this and similar shortcuts in Chrome so that the shortcut/function of the web site will work?

There are similar posts, but please note that I want to disable a specific set of shortcuts, not add new shortcuts! As far as I can see, applications/extensions like keyconfig or Shortcut Manager as described in customizing chromium keyboard shortcuts do not work.

If you are using Mac OS X you can alter the keyboard shortcut of any shortcut exposed in the menu bar. You need to take note of the exact name of the menu item you want to change, which in this example is, "Always Show Bookmarks Bar". Then go to the Shortcuts section of the Keyboard preferences in System Preferences. Click App Shortcuts, and add a new Google Chrome specific shortcut that changes the "Always Show Bookmarks Bar" shortcut to something else:

Return to Chrome and you will see the Always Show Bookmarks Bar shortcut has changed: