[SVG] Restore the non-selection style after painting the selected run

After having painted the selection-styled text run, the resources need to
be re-acquired with the non-selection style.

BUG=415632

Review URL: https://codereview.chromium.org/585563002

git-svn-id: svn://svn.chromium.org/blink/trunk@182311 bbb929c8-8fbe-4397-9dbb-9b2b20218538