WebCrypto: Add algorithm normalization rules for RSAES-PKCS1-v1_5.

LayoutTests/crypto/sign-verify.html

Index: LayoutTests/crypto/sign-verify.html
diff --git a/LayoutTests/crypto/sign-verify.html b/LayoutTests/crypto/sign-verify.html
index cb2a00a840b439062c11b9acac231a8a75beb860..8a3c54622af17eb759627f87c9dcb14ab2ce32e9 100644
--- a/LayoutTests/crypto/sign-verify.html
+++ b/LayoutTests/crypto/sign-verify.html
@@ -27,6 +27,10 @@ importTestKeys().then(function(importedKeys) {
     // Operation does not support signing.
     shouldThrow("crypto.subtle.sign({name: 'sha-1'}, keys.hmacSha1, data)");
 
+    // Operation doesn't support signing (also given an invalid key, but the
+    // first failure takes priority)
+    shouldThrow("crypto.subtle.sign({name: 'RSAES-PKCS1-v1_5'}, keys.hmacSha1, data)");
+
     // Key's algorithm must match.
     shouldThrow("crypto.subtle.sign({name: 'hmac', hash: {name: 'sha-256'}}, keys.hmacSha1, data)");