More tests for GURL's is_valid() and authority parser

BUG=none

Review URL: https://codereview.chromium.org/238973006

git-svn-id: https://src.chromium.org/chrome/trunk/src/url@264757 4ff67af0-8c30-449e-8e8b-ad334ec8d88c
Renamed namespaces in src/url.
url_util -> url
url_parse -> url
url_canon -> url

BUG=364747
R=brettw@chromium.org, thestig@chromium.org, willchan@chromium.org

Review URL: https://codereview.chromium.org/242463002

git-svn-id: https://src.chromium.org/chrome/trunk/src/url@265120 4ff67af0-8c30-449e-8e8b-ad334ec8d88c