GitLab

Moves source of the various components of the user agent
product name and version to ChromeVersionInfo, and
exposes them in ChromeContentClient.

BUG=255053

Review URL: https://chromiumcodereview.appspot.com/18055008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@209317 0039d316-1c4b-4281-b951-d872f2087c98