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Finding the routing id requires LaunchSelLdr to run from the
main thread.  However, some sel_ldr instances host nexes that do
not actually need to use Pepper APIs (e.g., the PNaCl translator),
and should be run on a background thread.

BUG= http://code.google.com/p/nativeclient/issues/detail?id=3176


Review URL: https://chromiumcodereview.appspot.com/11428063

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@171020 0039d316-1c4b-4281-b951-d872f2087c98