Cache the file descriptor for /dev/urandom to avoid needing to reopen it for every call.
Cache the file descriptor for /dev/urandom to avoid needing to reopen it for every call.

Patch by Mike Mammarella.

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/144010


git-svn-id: http://src.chromium.org/svn/trunk/src@19352 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 693f59ca7c877d2d46fd2423835a2ba8cce8f45b
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