Remove DEFINE_STATIC_LOCAL in CSPDirectiveList.
Remove DEFINE_STATIC_LOCAL in CSPDirectiveList.

DEFINE_STATIC_LOCAL is not thread safe, and the methods that have
DEFINE_STATIC_LOCAL in CSPDirectiveList seem to be called from multiple threads.

BUG=373138

Review URL: https://codereview.chromium.org/847393006

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@188462 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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