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Also changes FindTrustAnchorsByNormalizedName to FindTrustAnchorsForCert, as
some different implementations may do normalization differently. By passing in
the target cert, the implementation can decide whether to use the
pre-normalized issuer or the raw one.

BUG=635203

Review-Url: https://codereview.chromium.org/2266333002
Cr-Commit-Position: refs/heads/master@{#414875}