Roll libvpx_revision to 81405.
Roll libvpx_revision to 81405.

BUG=69288
TEST=None
Review URL: http://codereview.chromium.org/6836013

git-svn-id: http://src.chromium.org/svn/trunk/src@81492 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 17d14b02e485b677e20ae877646d88d19ed74e1a
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