[webcrypto] Remove support for AES 192-bit keys (1 of 2)

LayoutTests/crypto/aes-cbc-encrypt-decrypt.html

Index: LayoutTests/crypto/aes-cbc-encrypt-decrypt.html
diff --git a/LayoutTests/crypto/aes-cbc-encrypt-decrypt.html b/LayoutTests/crypto/aes-cbc-encrypt-decrypt.html
index ee6af9923a474d4eef1da5131bf66847a9d64a7e..610627fea2ff18c3180ee8203fb6055914f48cfc 100644
--- a/LayoutTests/crypto/aes-cbc-encrypt-decrypt.html
+++ b/LayoutTests/crypto/aes-cbc-encrypt-decrypt.html
@@ -35,18 +35,6 @@ var kAesCbcSuccessVectors = [
                 "8cb82807230e1321d3fae00d18cc2012"
   },
 
-  // 192-bit key, where final block of plaintext has to pad by 15.
-  // Derived from [1] F.2.3 (CBC-AES192.Encrypt), by stripping 15 bytes off
-  // plaintext and adding padding block.
-  {
-    key: "8e73b0f7da0e6452c810f32b809079e562f8ead2522c6b7b",
-    iv: "000102030405060708090a0b0c0d0e0f",
-    plainText: "6bc1bee22e409f96e93d7e117393172aae2d8a571e03ac9c9eb76fac45af8e5130c81c46a35ce411e5fbc1191a0a52eff6",
-    cipherText: "4f021db243bc633d7178183a9fa071e8b4d9ada9ad7dedf4e5e738763f69145a571b242012fb7ae07fa9baac3df102e0" +
-                // Padding block.
-                "288c6f9ec554652e50ab55e121f099ae"
-  },
-
   // 256-bit key, where final block of plaintext has to pad by 3.
   // Derived from [1] F.2.6 CBC-AES256.Decrypt, by stripping 3 bytes off
   // plaintext and adding padding block.