Although the scrollbar is not always visible in Chrome for Android, it is always present (when the page extends past the end of the screen) and will intercept touches on the edge of the screen.
As you scroll vertically on the Nexus, look for a gray bar on the right side. It is hidden when you are not scrolling, but it is still there and will still receive touches. The color of the scroll bar can also make it hard to see on certain backgrounds (such as the gray I see in your screenshot).
When I'm not touching the screen:
When I'm scrolling: