Fourth side of two-sided patch for URL encoding. Restores KURLTest.Encoding unit test (omission from previous patch).

BUG=292740
TBR=abarth@chromium.org

Review URL: https://chromiumcodereview.appspot.com/24489003

git-svn-id: svn://svn.chromium.org/blink/trunk@158342 bbb929c8-8fbe-4397-9dbb-9b2b20218538