Validate offset / length of extra field in the message. Note these fields are decoded and set in a structure but unsused, so this is not a current security issue. This change just future-proofs the area in case these fields are used one day.
Validate offset / length of extra field in the message. Note these fields are
decoded and set in a structure but unsused, so this is not a current security
issue. This change just future-proofs the area in case these fields are used
one day.

BUG=NONE
TEST=NONE

Review URL: http://codereview.chromium.org/155311

git-svn-id: http://src.chromium.org/svn/trunk/src@20315 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 884750ccc33a6be991aa2ecd6433fb1b6b64f53e
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser