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Reserve 1GB at the base of the address space of linux nacl_helper for Native Client module. Use PathService instead of command line flag to enable helper. Adds a nacl_helper_bootstrap executable that implements the actual space reservation.

See http://codereview.chromium.org/7599011 for extended revision history. This is a gyp fix following a revert.

TBR=agl,bradnelson

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

Review URL: http://codereview.chromium.org/7670011

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@97056 0039d316-1c4b-4281-b951-d872f2087c98