posix: ignore SIGPIPE in all processes, not just the browser
posix: ignore SIGPIPE in all processes, not just the browser

E.g. plugin<->renderer channel can go down, causing SIGPIPE instead of a
normal error.

Review URL: http://codereview.chromium.org/155390

git-svn-id: http://src.chromium.org/svn/trunk/src@20448 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 413c5eefb0779d9c0eac7f460aa364d178e52979
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