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Also adds DEPS to keep chromeos dependencies out of ash/system

This is part of an effort to move chromeos network management code from src/chrome/ to src/chromeos.

BUG=154856

Review URL: https://chromiumcodereview.appspot.com/11039034

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@162377 0039d316-1c4b-4281-b951-d872f2087c98