[cros] migrate to safe ownership API
[cros] migrate to safe ownership API

I was passing memory from libcros to chrome and expecting chrome to
free it.  I was also passing vectors across the DLL boundary.  These
could both cause memory horkage.

Having implemented safe alternatives in http://codereview.chromium.org/4132006, migrate to them.  Depends on cros_deps roll in http://codereview.chromium.org/4207004/show

BUG=chromium-os:8283
TEST=install on the device, log in as the first account, whitelist users, disable BWSI

Review URL: http://codereview.chromium.org/4240001

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@64756 0039d316-1c4b-4281-b951-d872f2087c98

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