Removal of more temporary Range objects.

The DOM/textarea-edit benchmark now creates no temporary ranges at all.

R=yosin@chromium.org
BUG=388681

Review URL: https://codereview.chromium.org/576073003

git-svn-id: svn://svn.chromium.org/blink/trunk@182224 bbb929c8-8fbe-4397-9dbb-9b2b20218538