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We do some relatively minor changes to our policies and adopt
a baseline on which the GPU and Flash policies are now based.

We allow a few more syscalls than we used to to make our sandbox
more robust against library updates or rarely exercised codepaths.

BUG=


Review URL: https://chromiumcodereview.appspot.com/10837156

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150914 0039d316-1c4b-4281-b951-d872f2087c98