But when you consider the fact that browsers these days are essentially operating systems in their own right, complete with a suite of bundled application functionality (e.g. WebRTC, WebGL, SVG, etc.)... it seems pretty reasonable.
Right-click on it and go to Show Package Contents. Then navigate to Contents > Frameworks > Google Chrome Framework.framework > Versions
You'll also see a symbolic link to 'Current'. Right-click > Get Info. on that to see which folder to 'not' delete.
I've got 2 versions (230.1 MB and 228.7 MB). The commenter I was responding to therefore must have 3. So the "real" size is ~230 MB, which does seem pretty reasonable, and totally in line with Firefox as well.
(For comparison, Calibre is 207 MB, Gimp is 224 MB, and Kindle is 210 MB, while Word is a whopping 2.11 GB, and Photoshop is a similarly gigantic 2.45 GB.)