Finally successfully linked the chromium libraries with my own test runner after adding a few more compiler flags to match those used by chromium. After getting it linked and running, found it would crash on the first callback made when the page completed loading, complaining about missing vector functions.

Had to rebuild my chromium source as I had been using a debug build, which generated debug versions of some STL containers and caused crashes when other parts of code expected regular containers. It now links and runs and outputs useful data!