GitLab

The default extensions should be able to load NaCl modules.
This is a problem now because they aren't really distinguishable from normal extensions. To fix
this, mark them as "from webstore" when they're loaded.

Also, revert crrev.com/130235 as that didn't work

BUG=chromium-os:28707
TEST=none

Review URL: https://chromiumcodereview.appspot.com/10269031

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@134761 0039d316-1c4b-4281-b951-d872f2087c98