Refactor to share more code between OpenSSL and NSS implementations.

content/renderer/webcrypto/webcrypto_util.cc

Index: content/renderer/webcrypto/webcrypto_util.cc
diff --git a/content/renderer/webcrypto/webcrypto_util.cc b/content/renderer/webcrypto/webcrypto_util.cc
index 3124afa7dfdf2594f575ba43149d29a155896d17..dfc641f2b3796c0dbe42af620468e7ed5e97f5d0 100644
--- a/content/renderer/webcrypto/webcrypto_util.cc
+++ b/content/renderer/webcrypto/webcrypto_util.cc
@@ -107,6 +107,10 @@ Status Status::ErrorUnexpectedKeyType() {
   return Status("The key is not of the expected type");
 }
 
+Status Status::ErrorKeyAlgorithmMismatch() {
+  return Status("The key's algorithm doesn't match that of operation");
+}
+
 Status Status::ErrorIncorrectSizeAesCbcIv() {
   return Status("The \"iv\" has an unexpected length -- must be 16 bytes");
 }