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This CL is unremarkable except that I figured out that we're improperly
including some permissions for experimental APIs (which are already
covered by the blanket experimental permission). This made it tougher
because I used http://codereview.chromium.org/10440097/, which
benefited unwittingly from a pre-declared socket permission, as an
example. I then ran into missing namespace problems because I hadn't
done everything necessary (such as including serial in api_permission.cc).

I did my job as a good citizen and removed the superfluous USB permission.

Also ran build.py to update docs.

BUG=138370
TEST=no new ones; updated old ones to build.

Review URL: https://chromiumcodereview.appspot.com/10852016

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@150186 0039d316-1c4b-4281-b951-d872f2087c98