Make api:create_peerconnection_factory public.

TBR=kwiberg@webrtc.org

Bug: None
Change-Id: I21449f28d49a0525d2cfd864a1ed3a17239adfcc
No-Try: True
Reviewed-on: https://webrtc-review.googlesource.com/c/111257
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25692}
diff --git a/api/BUILD.gn b/api/BUILD.gn
index 13a7a29..ea22b03 100644
--- a/api/BUILD.gn
+++ b/api/BUILD.gn
@@ -45,6 +45,7 @@
 }
 
 rtc_static_library("create_peerconnection_factory") {
+  visibility = [ "*" ]
   sources = [
     "create_peerconnection_factory.cc",
     "create_peerconnection_factory.h",