According to "chrome install location osx", which leads to How do I change the Chrome installation folder on a Mac?, it is with the rest of the applications in the usual spot at /Applications/Google Chrome.app.

If it's not there, multiple techniques for locating it (or any application) can be found here (also via the search results above):

• In a terminal:

  find / -type d -name "*Chrome.app"
  

• In a terminal (answerer was using Mountain Lion):

  /System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -dump | grep -i "google chrome"
  

I suppose you could also search your computer for "Google Chrome.app".

The related questions on the right side of this page also contain useful information. For example, How do I uninstall Google Chrome *completely* from my Mac? shows where application settings are located.