Drop 'non-native frame' bits from ContentSecurityPolicy.
Drop 'non-native frame' bits from ContentSecurityPolicy.

We only required the jump to the second frame in the stack for JSC, which often
showed "native" as the top frame. V8 works differently, so we can remove this
function and just look at the top frame.

Review URL: https://chromiumcodereview.appspot.com/14682011

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@149776 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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