[webcrypto] Add JWK import for HMAC and AES-CBC key.

content/renderer/webcrypto/webcrypto_impl_openssl.cc

Index: content/renderer/webcrypto/webcrypto_impl_openssl.cc
diff --git a/content/renderer/webcrypto/webcrypto_impl_openssl.cc b/content/renderer/webcrypto/webcrypto_impl_openssl.cc
index 2bf800ecf3997cbc080fe50c883f714e71c19e57..f8b6eb6dfee76405c78a4b89331de12c46445224 100644
--- a/content/renderer/webcrypto/webcrypto_impl_openssl.cc
+++ b/content/renderer/webcrypto/webcrypto_impl_openssl.cc
@@ -143,14 +143,10 @@ bool WebCryptoImpl::ImportKeyInternal(
     return false;
   }
 
-  // TODO(padolph): Need to split handling for symmetric (raw or jwk format) and
-  // asymmetric (jwk, spki, or pkcs8 format) keys.
+  // TODO(padolph): Need to split handling for symmetric (raw format) and
+  // asymmetric (spki or pkcs8 format) keys.
   // Currently only supporting symmetric.
 
-  // TODO(padolph): jwk handling. Define precedence between jwk contents and
-  // this method's parameters, e.g. 'alg' in jwk vs algorithm.id(). Who wins if
-  // they differ? (jwk, probably)
-
   // Symmetric keys are always type secret
   *type = WebKit::WebCryptoKeyTypeSecret;