Refactor RSA key generation for WebCrypto's NSS implementation.

content/child/webcrypto/status.cc

Index: content/child/webcrypto/status.cc
diff --git a/content/child/webcrypto/status.cc b/content/child/webcrypto/status.cc
index 9439c933db13e999fb7dec2deaf30eac2b33c9da..9c53f061de46302e9df331944400768d3d49257d 100644
--- a/content/child/webcrypto/status.cc
+++ b/content/child/webcrypto/status.cc
@@ -195,6 +195,12 @@ Status Status::ErrorGenerateRsaZeroModulus() {
                 "The modulus bit length cannot be zero");
 }
 
+Status Status::ErrorGenerateRsaUnsupportedModulus() {
+  return Status(blink::WebCryptoErrorTypeNotSupported,
+                "The modulus length must be a multiple of 8 bits and >= 256 "
+                "and <= 16384");
+}
+
 Status Status::ErrorImportRsaEmptyExponent() {
   return Status(blink::WebCryptoErrorTypeData,
                 "No bytes for the exponent were provided");