Make SSLClientSocketImpl::SSLContext a leaky singleton.

net/socket/ssl_client_socket_impl.cc

Index: net/socket/ssl_client_socket_impl.cc
diff --git a/net/socket/ssl_client_socket_impl.cc b/net/socket/ssl_client_socket_impl.cc
index 4e3f71311c7c2a4974e2337bc0f583724f3b8a46..b6dbd8a794fe2149fd75c45fb8e41b57e0de3168 100644
--- a/net/socket/ssl_client_socket_impl.cc
+++ b/net/socket/ssl_client_socket_impl.cc
@@ -242,7 +242,8 @@ const base::Feature kShortRecordHeaderFeature{
 class SSLClientSocketImpl::SSLContext {
  public:
   static SSLContext* GetInstance() {
-    return base::Singleton<SSLContext>::get();
+    return base::Singleton<SSLContext,
+                           base::LeakySingletonTraits<SSLContext>>::get();
   }
   SSL_CTX* ssl_ctx() { return ssl_ctx_.get(); }
   SSLClientSessionCache* session_cache() { return &session_cache_; }