Remove unsafe DEFINE_STATIC_LOCAL in XSSAuditor
Remove unsafe DEFINE_STATIC_LOCAL in XSSAuditor

It looks they can probably simply be constant strings.

BUG=373139

Review URL: https://codereview.chromium.org/868953003

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@188859 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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