[content shell] avoid accessing the filesystem when io restrictions are enabled

BUG=111316
TEST=content_shell doesn't trigger thread io restrictions in debug mode


Review URL: https://chromiumcodereview.appspot.com/11363137

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@166751 0039d316-1c4b-4281-b951-d872f2087c98
4 files changed