Add media dep to NaCl in preparation of shared target.

Add media dep to NaCl in preparation of shared target.

media will soon be exposing a target which NaCl can use for
interfacing with the shared memory between the renderer and
browser side processes.

Using the new target allows a bunch of duplicated code to be
removed ensuring NaCl never has to worry about being out of
date.

BUG=123203
TEST=none
Committed: https://src.chromium.org/viewvc/native_client?view=rev&revision=9566

[DaleCurtis, 2012-08-17 02:11:20]

PTAL. This is the product of our discussion via chat.

[nfullagar, 2012-08-17 20:20:28]

lgtm, commit after http://codereview.chromium.org/10826296/ goes in on the
chrome side.  (One of the integration bots will go red, then this CL should turn
it green again.)

[bradn, 2012-08-24 20:21:09]

lgtm