GitLab

Also call base::GetLinuxDistro() on the blocking pool and not on the IO thread
because it may block.

Review URL: https://codereview.chromium.org/299903002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@274615 0039d316-1c4b-4281-b951-d872f2087c98