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Use PathService instead of command line flag to enable helper. Adds a nacl_helper_bootstrap executable that implements the actual space reservation.

This is for resubmit of reverted CL 7670011, fixing nacl.gypi for the linux_shared build.

See 7670011 and 7599011 for review history.

TBR=agl,bradnelson

BUG=92964, nativeclient:480
TEST=manual for now

Review URL: http://codereview.chromium.org/7655010

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@97137 0039d316-1c4b-4281-b951-d872f2087c98