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RSAPrivateKey is not used on iOS, but code calling it is compiled. To avoid
ifdef'ing in the client code, the class is stubbed out.

Review URL: https://chromiumcodereview.appspot.com/10823309

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@152300 0039d316-1c4b-4281-b951-d872f2087c98