[webcrypto] Add JWK import of RSA public key for NSS.

content/renderer/webcrypto/webcrypto_util.h

Index: content/renderer/webcrypto/webcrypto_util.h
diff --git a/content/renderer/webcrypto/webcrypto_util.h b/content/renderer/webcrypto/webcrypto_util.h
index 99b2a6ad058f3a98bb9fb5e73854a41da46e2fbf..68cca90e3f0528f00462591f68210ee09890c40e 100644
--- a/content/renderer/webcrypto/webcrypto_util.h
+++ b/content/renderer/webcrypto/webcrypto_util.h
@@ -25,10 +25,7 @@ const uint8* Start(const std::vector<uint8>& data);
 void ShrinkBuffer(blink::WebArrayBuffer* buffer, unsigned new_size);
 
 // This function decodes unpadded 'base64url' encoded data, as described in
-// RFC4648 (http://www.ietf.org/rfc/rfc4648.txt) Section 5. To do this, first
-// change the incoming data to 'base64' encoding by applying the appropriate
-// transformation including adding padding if required, and then call a base64
-// decoder.
+// RFC4648 (http://www.ietf.org/rfc/rfc4648.txt) Section 5.
 // In Web Crypto, this type of encoding is only used inside JWK.
 bool Base64DecodeUrlSafe(const std::string& input, std::string* output);