Remove platform-specific implementations of RSAPrivateKey and SignatureCreator

crypto/rsa_private_key_nss.cc

Index: crypto/rsa_private_key_nss.cc
diff --git a/crypto/rsa_private_key_nss.cc b/crypto/rsa_private_key_nss.cc
index a89454e378442f92469ea38f99780f2bd3349a0e..977460ff92dbfec5fdcbf0a2733f520767873532 100644
--- a/crypto/rsa_private_key_nss.cc
+++ b/crypto/rsa_private_key_nss.cc
@@ -19,8 +19,7 @@
 #include "crypto/nss_util_internal.h"
 #include "crypto/scoped_nss_types.h"
 
-// TODO(rafaelw): Consider refactoring common functions and definitions from
-// rsa_private_key_win.cc or using NSS's ASN.1 encoder.
+// TODO(rafaelw): Consider using NSS's ASN.1 encoder.
 namespace {
 
 static bool ReadAttribute(SECKEYPrivateKey* key,
@@ -96,6 +95,7 @@ RSAPrivateKey* RSAPrivateKey::CreateFromKey(SECKEYPrivateKey* key) {
   return copy;
 }
 
+#if defined(USE_NSS)
 // static
 RSAPrivateKey* RSAPrivateKey::FindFromPublicKeyInfo(
     const std::vector<uint8>& input) {
@@ -153,6 +153,7 @@ RSAPrivateKey* RSAPrivateKey::FindFromPublicKeyInfo(
   // We didn't find the key.
   return NULL;
 }
+#endif
 
 RSAPrivateKey* RSAPrivateKey::Copy() const {
   RSAPrivateKey* copy = new RSAPrivateKey();