Move Cast certificate verification code from extensions to components.

extensions/test/data/cast_certificates/unchained.pem

-$ openssl x509 -text -noout < [CERTIFICATE]
-Certificate:
-    Data:
-        Version: 3 (0x2)
-        Serial Number: 30 (0x1e)
-    Signature Algorithm: sha256WithRSAEncryption
-        Issuer: C=US, ST=California, L=Mountain View, O=Google Inc, OU=Cast, CN=Cast Test Untrusted ICA
-        Validity
-            Not Before: Jan 22 00:02:35 2015 GMT
-            Not After : Jan 17 00:02:35 2035 GMT
-        Subject: C=US, ST=California, L=Mountain View, O=Google Inc, OU=Cast, CN=Cast Test Untrusted Device
-        Subject Public Key Info:
-            Public Key Algorithm: rsaEncryption
-                Public-Key: (2048 bit)
-                Modulus:
-                    00:bb:68:cb:94:9a:ca:8b:41:40:8a:b7:50:6d:e4:
-                    c9:d1:d5:c7:81:f6:c6:44:7e:cc:b3:de:bc:77:68:
-                    97:88:f5:ce:40:cc:f5:8f:d2:d1:44:3b:a5:8b:54:
-                    d3:05:02:b3:dc:04:ee:b1:17:31:2c:6d:bf:bc:23:
-                    a6:f2:55:7d:c1:f3:94:7e:65:f2:b5:5f:fc:c3:91:
-                    fb:91:f2:d0:4f:88:33:1a:56:f9:de:f2:d3:8f:a9:
-                    58:1e:1f:e2:0e:99:ac:3b:6c:32:93:89:37:68:c3:
-                    7a:e6:28:12:8e:cf:3a:a2:10:64:d5:f8:6b:31:99:
-                    3d:88:56:04:1c:93:7e:5e:e3:9c:ed:a6:e3:3c:13:
-                    56:bc:0c:39:32:ff:4d:3e:2a:6e:b9:6e:4d:61:35:
-                    2d:e8:ac:ed:bd:7e:e8:66:21:7c:8c:29:17:b1:b7:
-                    d2:36:0b:bb:a1:a8:91:73:32:76:75:cc:87:6d:a8:
-                    b9:53:78:0b:9a:08:01:0c:09:b3:34:ac:42:1c:ec:
-                    d2:bb:50:09:9c:b7:63:41:aa:65:a9:47:0c:88:bd:
-                    f7:e4:94:c6:3e:47:69:ad:88:99:9b:8e:6f:d4:24:
-                    19:59:0a:22:a9:7d:be:f9:26:d1:75:68:07:e0:7f:
-                    8a:e6:72:f9:d4:5c:b3:66:21:a8:5e:2c:51:17:76:
-                    86:ab
-                Exponent: 65537 (0x10001)
-        X509v3 extensions:
-            X509v3 Basic Constraints: 
-                CA:FALSE
-            X509v3 Subject Key Identifier: 
-                74:4B:08:93:5E:9E:C0:19:7B:B9:0E:17:83:87:10:B8:97:B4:45:EB
-            X509v3 Authority Key Identifier: 
-                keyid:6B:7E:E5:CA:B2:CD:E5:F1:71:14:86:E2:E5:2D:66:A8:59:A8:54:88
-
-            X509v3 Key Usage: 
-                Digital Signature
-            X509v3 Extended Key Usage: 
-                TLS Web Client Authentication
-    Signature Algorithm: sha256WithRSAEncryption
-         6c:7a:82:f8:1a:ec:e8:ed:45:3f:12:d4:d5:8f:2c:84:1b:99:
-         2a:d3:e5:6c:e2:b2:f5:cb:3e:8d:11:82:d0:3f:08:f5:fb:a8:
-         21:4a:04:c9:bd:5e:eb:3b:8a:4d:61:3f:3e:86:ff:ca:13:2e:
-         49:b1:1f:d7:0b:6f:58:9e:cc:02:96:95:01:81:ac:11:19:fa:
-         a5:0e:e8:8f:16:fd:60:6f:b2:c5:34:fa:a7:4f:4f:30:64:63:
-         9a:da:ef:81:73:fc:d0:fb:40:89:5e:b0:98:cb:0d:b2:e7:ac:
-         56:5b:ef:77:22:db:50:f9:d5:93:dd:a9:16:7e:c1:4e:24:20:
-         fe:7c:d5:a3:2e:63:86:18:f1:e2:61:96:d8:bd:e9:af:ef:a8:
-         9a:8f:3c:89:86:7e:60:ce:a2:7c:c4:e4:19:93:90:6e:64:92:
-         47:bd:b4:67:5a:8a:b4:a7:c8:eb:69:e6:3a:cb:ac:7e:87:a7:
-         57:17:cc:02:c5:a0:85:bc:42:6e:26:b8:ed:95:ef:41:f1:75:
-         95:f2:10:39:80:79:8b:2e:45:75:59:2d:36:3f:04:dc:11:0d:
-         b0:da:a0:0a:22:20:4d:be:b5:a0:aa:19:7d:7b:78:11:9a:9e:
-         e0:02:5c:20:0b:87:da:91:4b:e6:b2:a7:b8:d0:a3:07:16:3d:
-         bf:b7:31:e0
------BEGIN CERTIFICATE-----
-MIID7zCCAtegAwIBAgIBHjANBgkqhkiG9w0BAQsFADCBgDELMAkGA1UEBhMCVVMxEzARBgNVBAg
-MCkNhbGlmb3JuaWExFjAUBgNVBAcMDU1vdW50YWluIFZpZXcxEzARBgNVBAoMCkdvb2dsZSBJbm
-MxDTALBgNVBAsMBENhc3QxIDAeBgNVBAMMF0Nhc3QgVGVzdCBVbnRydXN0ZWQgSUNBMB4XDTE1M
-DEyMjAwMDIzNVoXDTM1MDExNzAwMDIzNVowgYMxCzAJBgNVBAYTAlVTMRMwEQYDVQQIDApDYWxp
-Zm9ybmlhMRYwFAYDVQQHDA1Nb3VudGFpbiBWaWV3MRMwEQYDVQQKDApHb29nbGUgSW5jMQ0wCwY
-DVQQLDARDYXN0MSMwIQYDVQQDDBpDYXN0IFRlc3QgVW50cnVzdGVkIERldmljZTCCASIwDQYJKo
-ZIhvcNAQEBBQADggEPADCCAQoCggEBALtoy5SayotBQIq3UG3kydHVx4H2xkR+zLPevHdol4j1z
-kDM9Y/S0UQ7pYtU0wUCs9wE7rEXMSxtv7wjpvJVfcHzlH5l8rVf/MOR+5Hy0E+IMxpW+d7y04+p
-WB4f4g6ZrDtsMpOJN2jDeuYoEo7POqIQZNX4azGZPYhWBByTfl7jnO2m4zwTVrwMOTL/TT4qbrl
-uTWE1Leis7b1+6GYhfIwpF7G30jYLu6GokXMydnXMh22ouVN4C5oIAQwJszSsQhzs0rtQCZy3Y0
-GqZalHDIi99+SUxj5Haa2ImZuOb9QkGVkKIql9vvkm0XVoB+B/iuZy+dRcs2YhqF4sURd2hqsCA
-wEAAaNvMG0wCQYDVR0TBAIwADAdBgNVHQ4EFgQUdEsIk16ewBl7uQ4Xg4cQuJe0ReswHwYDVR0j
-BBgwFoAUa37lyrLN5fFxFIbi5S1mqFmoVIgwCwYDVR0PBAQDAgeAMBMGA1UdJQQMMAoGCCsGAQU
-FBwMCMA0GCSqGSIb3DQEBCwUAA4IBAQBseoL4Guzo7UU/EtTVjyyEG5kq0+Vs4rL1yz6NEYLQPw
-j1+6ghSgTJvV7rO4pNYT8+hv/KEy5JsR/XC29YnswClpUBgawRGfqlDuiPFv1gb7LFNPqnT08wZ
-GOa2u+Bc/zQ+0CJXrCYyw2y56xWW+93IttQ+dWT3akWfsFOJCD+fNWjLmOGGPHiYZbYvemv76ia
-jzyJhn5gzqJ8xOQZk5BuZJJHvbRnWoq0p8jraeY6y6x+h6dXF8wCxaCFvEJuJrjtle9B8XWV8hA
-5gHmLLkV1WS02PwTcEQ2w2qAKIiBNvrWgqhl9e3gRmp7gAlwgC4fakUvmsqe40KMHFj2/tzHg
------END CERTIFICATE-----