Have chromedriver use chrome/common/chrome_constants.cc directly rather than having to hardcode a copy or depend on the full target itself.

akin to https://codereview.chromium.org/163763004/

BUG=343692

Review URL: https://codereview.chromium.org/165053002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@251804 0039d316-1c4b-4281-b951-d872f2087c98