Don't initialize NSS before calling SSL_ClearSessionCache.

net/socket/ssl_client_socket_nss.cc

Index: net/socket/ssl_client_socket_nss.cc
===================================================================
--- net/socket/ssl_client_socket_nss.cc	(revision 113498)
+++ net/socket/ssl_client_socket_nss.cc	(working copy)
@@ -482,9 +482,8 @@
 
 // static
 void SSLClientSocketNSS::ClearSessionCache() {
-  // Initialize the NSS SSL library in a threadsafe way.  This also
-  // initializes the NSS base library.
-  EnsureNSSSSLInit();
+  // SSL_ClearSessionCache can't be called before NSS is initialized.  Don't
+  // bother initializing NSS just to clear an empty SSL session cache.
   if (!NSS_IsInitialized())
     return;