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NSS would use "" as the password while OpenSSL would use "\0\0" (UCS-2 encoding
of a NUL-terminated string) because of how PKCS#12 recommended encoding
passwords. Make the OpenSSL code use the same format so that we can freely switch
back and forth between NSS and OpenSSL.

(This is in case we need to roll back an OpenSSL cutover and the release has
hit some early release channel already.)

BUG=399121

Review URL: https://codereview.chromium.org/435593003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287890 0039d316-1c4b-4281-b951-d872f2087c98