gcc 4.6.1 -Wall -Werror fix.
gcc 4.6.1 -Wall -Werror fix.

missed a cast in XYZZY magic function.  sigh.

TBR= sehr@google.com

BUG= http://code.google.com/p/chromium/issues/detail?id=87490
Review URL: http://codereview.chromium.org/8373024

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@106963 0039d316-1c4b-4281-b951-d872f2087c98

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