Revert of purge nss files and dependencies

webrtc/base/ssladapter.cc

Index: webrtc/base/ssladapter.cc
diff --git a/webrtc/base/ssladapter.cc b/webrtc/base/ssladapter.cc
index 77ad90b504154b6ae62772abd713323b4b19104a..d83a2779e8e1230ca0d1fc8c557cae50d01037c2 100644
--- a/webrtc/base/ssladapter.cc
+++ b/webrtc/base/ssladapter.cc
@@ -24,7 +24,11 @@
 
 #include "openssladapter.h"
 
-#endif  // SSL_USE_OPENSSL && !SSL_USE_SCHANNEL
+#elif SSL_USE_NSS     // && !SSL_USE_CHANNEL && !SSL_USE_OPENSSL
+
+#include "nssstreamadapter.h"
+
+#endif  // SSL_USE_OPENSSL && !SSL_USE_SCHANNEL && !SSL_USE_NSS
 
 ///////////////////////////////////////////////////////////////////////////////
 
@@ -58,7 +62,21 @@
   return OpenSSLAdapter::CleanupSSL();
 }
 
-#else  // !SSL_USE_OPENSSL
+#elif SSL_USE_NSS  // !SSL_USE_OPENSSL
+
+bool InitializeSSL(VerificationCallback callback) {
+  return NSSContext::InitializeSSL(callback);
+}
+
+bool InitializeSSLThread() {
+  return NSSContext::InitializeSSLThread();
+}
+
+bool CleanupSSL() {
+  return NSSContext::CleanupSSL();
+}
+
+#else  // !SSL_USE_OPENSSL && !SSL_USE_NSS
 
 bool InitializeSSL(VerificationCallback callback) {
   return true;
@@ -72,7 +90,7 @@
   return true;
 }
 
-#endif  // !SSL_USE_OPENSSL
+#endif  // !SSL_USE_OPENSSL && !SSL_USE_NSS
 
 ///////////////////////////////////////////////////////////////////////////////