Remove CertTrustAnchorProvider from net

net/cert/caching_cert_verifier.h

Index: net/cert/caching_cert_verifier.h
diff --git a/net/cert/caching_cert_verifier.h b/net/cert/caching_cert_verifier.h
index 523f72c2982b4d1b0ed04a31209fdaf992184ce3..90b5415063fa6ca4dc65d6f0436d8d35b738ec05 100644
--- a/net/cert/caching_cert_verifier.h
+++ b/net/cert/caching_cert_verifier.h
@@ -15,8 +15,6 @@
 
 namespace net {
 
-class CertTrustAnchorProvider;
-
 // CertVerifier that caches the results of certificate verifications.
 //
 // In general, certificate verification results will vary on only three
@@ -43,13 +41,6 @@ class NET_EXPORT CachingCertVerifier : public CertVerifier,
 
   ~CachingCertVerifier() override;
 
-  // Configures a source of additional certificates that should be treated as
-  // trust anchors during verification, provided that the underlying
-  // CertVerifyProc supports additional trust beyond the default implementation.
-  // It must outlive the CachingCertVerifier.
-  void SetCertTrustAnchorProvider(
-      CertTrustAnchorProvider* trust_anchor_provider);
-
   // CertVerifier implementation:
   int Verify(const RequestParams& params,
              CRLSet* crl_set,
@@ -62,7 +53,6 @@ class NET_EXPORT CachingCertVerifier : public CertVerifier,
  private:
   FRIEND_TEST_ALL_PREFIXES(CachingCertVerifierTest, CacheHit);
   FRIEND_TEST_ALL_PREFIXES(CachingCertVerifierTest, DifferentCACerts);
-  FRIEND_TEST_ALL_PREFIXES(CachingCertVerifierTest, CertTrustAnchorProvider);
 
   // CachedResult contains the result of a certificate verification.
   struct NET_EXPORT_PRIVATE CachedResult {
@@ -128,8 +118,6 @@ class NET_EXPORT CachingCertVerifier : public CertVerifier,
 
   std::unique_ptr<CertVerifier> verifier_;
 
-  CertTrustAnchorProvider* trust_anchor_provider_;
-
   CertVerificationCache cache_;
 
   uint64_t requests_;