process_util_linux: mark functions that use /proc as safe for disk IO
process_util_linux: mark functions that use /proc as safe for disk IO

Reading files /proc is effectively just a kernel API; it's not unsafe
like accessing normal disk files is.

BUG=61136
TEST=no more DCHECKs in task manager

Review URL: http://codereview.chromium.org/4135015

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@64640 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser