So that the on-demand cases don't suffer additional delays, right now each pnacl pexe can incur upto 4 second delays.

A better fix is needed but this can be safely merged into m32.


TBR=sorin
BUG=none
TEST=none

Review URL: https://codereview.chromium.org/65603002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233714 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 233714