Refactor RSA key generation for WebCrypto's NSS implementation.

content/child/webcrypto/status.h

Index: content/child/webcrypto/status.h
diff --git a/content/child/webcrypto/status.h b/content/child/webcrypto/status.h
index 29bebe555261f9a8802702af7affd1a553942f97..e8ec6d47ebedf8dd908bde4a2de40a1db859ac16 100644
--- a/content/child/webcrypto/status.h
+++ b/content/child/webcrypto/status.h
@@ -176,9 +176,12 @@ class CONTENT_EXPORT Status {
   // The modulus bytes were empty when importing an RSA public key.
   static Status ErrorImportRsaEmptyModulus();
 
-  // The the modulus length was zero bits when generating an RSA public key.
+  // The modulus length was zero bits when generating an RSA key pair.
   static Status ErrorGenerateRsaZeroModulus();
 
+  // The modulus length was unsupported when generating an RSA key pair.
+  static Status ErrorGenerateRsaUnsupportedModulus();
+
   // The exponent bytes were empty when importing an RSA public key.
   static Status ErrorImportRsaEmptyExponent();