Revert of purge nss files and dependencies

webrtc/base/sslidentity.cc

Index: webrtc/base/sslidentity.cc
diff --git a/webrtc/base/sslidentity.cc b/webrtc/base/sslidentity.cc
index 0da254fcaa15666607ab9a9deb11d5fdab221de7..33b7387588633e8106817396e9b6e1f583397390 100644
--- a/webrtc/base/sslidentity.cc
+++ b/webrtc/base/sslidentity.cc
@@ -26,6 +26,10 @@
 #elif SSL_USE_OPENSSL  // !SSL_USE_SCHANNEL
 
 #include "webrtc/base/opensslidentity.h"
+
+#elif SSL_USE_NSS  // !SSL_USE_SCHANNEL && !SSL_USE_OPENSSL
+
+#include "webrtc/base/nssidentity.h"
 
 #endif  // SSL_USE_SCHANNEL
 
@@ -139,7 +143,27 @@
   return OpenSSLIdentity::FromPEMStrings(private_key, certificate);
 }
 
-#else  // !SSL_USE_OPENSSL && !SSL_USE_SCHANNEL
+#elif SSL_USE_NSS  // !SSL_USE_OPENSSL && !SSL_USE_SCHANNEL
+
+SSLCertificate* SSLCertificate::FromPEMString(const std::string& pem_string) {
+  return NSSCertificate::FromPEMString(pem_string);
+}
+
+SSLIdentity* SSLIdentity::Generate(const std::string& common_name,
+                                   KeyType key_type) {
+  return NSSIdentity::Generate(common_name, key_type);
+}
+
+SSLIdentity* SSLIdentity::GenerateForTest(const SSLIdentityParams& params) {
+  return NSSIdentity::GenerateForTest(params);
+}
+
+SSLIdentity* SSLIdentity::FromPEMStrings(const std::string& private_key,
+                                         const std::string& certificate) {
+  return NSSIdentity::FromPEMStrings(private_key, certificate);
+}
+
+#else  // !SSL_USE_OPENSSL && !SSL_USE_SCHANNEL && !SSL_USE_NSS
 
 #error "No SSL implementation"