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The destructor for base::SharedMemory closes its handle on destruction.
To keep a shared memory region alive after using it, we need to
duplicate the handle. This uses dup(), which is available in native
client.

BUG=


Review URL: https://chromiumcodereview.appspot.com/11817020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@176133 0039d316-1c4b-4281-b951-d872f2087c98