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..666f225aac3bd3715fa0b760ec2ece62bf26d5df 100644
--- a/content/child/webcrypto/status.cc
+++ b/content/child/webcrypto/status.cc
@@ -190,9 +190,10 @@ Status Status::ErrorImportRsaEmptyModulus() {
   return Status(blink::WebCryptoErrorTypeData, "The modulus is empty");
 }
 
-Status Status::ErrorGenerateRsaZeroModulus() {
-  return Status(blink::WebCryptoErrorTypeData,
-                "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() {