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Previously we would reject requests with pinning errors at the URLRequest layer
but, by that time, we would already have sent cookies.

The commenting of the #ifdef is deliberate - it allows the builders to chew the
code over. Once the builders are happy I'll land another change to uncomment
the #ifdefs.

This also happens to start unpicking the DNS certificate provenance stuff.

BUG=none
TEST=Verify that https://pinningtest.appspot.com fails to load in offical builds.

Review URL: http://codereview.chromium.org/8865006

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113823 0039d316-1c4b-4281-b951-d872f2087c98