GitLab

* Eliminate unused GetURL() function
* Simplify and inline GetText(), since the extra work it did for URLs was already done in SetURL()
* Eliminate |url_set_|, just switch based on whether the |url_| is empty

BUG=none
TEST=none
Review URL: https://chromiumcodereview.appspot.com/9837059

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@129009 0039d316-1c4b-4281-b951-d872f2087c98