Predeclare globals required by the test framework to avoid walking the prototype chain.
Predeclare globals required by the test framework to avoid walking the prototype chain.

Otherwise http/tests/security/xss-DENIED-method-with-iframe-proto.html double-faults while trying to read those global variables that aren't declared.

BUG=

Review URL: https://codereview.chromium.org/405893003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@178553 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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