Fix LINK and INCLUDE HTML inlining Regexes to Support End Tags on Different Lines

BUG=19

Patch from issue 18386002, landing for robliao@chromium.org.

Review URL: https://codereview.chromium.org/18568003

git-svn-id: http://grit-i18n.googlecode.com/svn/trunk@128 7262f16d-afe8-6277-6482-052fa10e57b1