Add a warning about Decrypt() being used as a padding oracle.
Add a warning about Decrypt() being used as a padding oracle.

R=agl@chromium.org,rsleevi@chromium.org
BUG=124434
TEST=none
Review URL: https://chromiumcodereview.appspot.com/10216004

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@133822 0039d316-1c4b-4281-b951-d872f2087c98

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