increase crypto_unittest key sizes to satisfy NSS 3.19.1

crypto/rsa_private_key_unittest.cc

Index: crypto/rsa_private_key_unittest.cc
diff --git a/crypto/rsa_private_key_unittest.cc b/crypto/rsa_private_key_unittest.cc
index b231cac6cc3110fa1fd231b65e1851c267193c52..9e7f6ff51fe044ae4ab05c2dffddc686012dcfd5 100644
--- a/crypto/rsa_private_key_unittest.cc
+++ b/crypto/rsa_private_key_unittest.cc
@@ -447,7 +447,8 @@ TEST(RSAPrivateKeyUnitTest, ShortIntegers) {
 
 TEST(RSAPrivateKeyUnitTest, CreateFromKeyTest) {
   scoped_ptr<crypto::RSAPrivateKey> key_pair(
-      crypto::RSAPrivateKey::Create(256));
+      crypto::RSAPrivateKey::Create(512));
+  ASSERT_TRUE(key_pair.get());
 
   scoped_ptr<crypto::RSAPrivateKey> key_copy(
       crypto::RSAPrivateKey::CreateFromKey(key_pair->key()));