Revert of Remove usage of deprecated g_type_init API (patchset #1 id:1 of https://codereview.webrtc.org/2660823003/ )

Reason for revert:
Reverting due to internal breakage. Will investigate and re-land

Original issue's description:
> Remove usage of deprecated g_type_init API
>
> BUG=webrtc:7024
>
> Review-Url: https://codereview.webrtc.org/2660823003
> Cr-Commit-Position: refs/heads/master@{#16376}
> Committed: https://chromium.googlesource.com/external/webrtc/+/b2caab7f6078ed46d4bda5103d7f8c93b896a518

TBR=kjellander@webrtc.org,perkj@webrtc.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=webrtc:7024

Review-Url: https://codereview.webrtc.org/2666103002
Cr-Commit-Position: refs/heads/master@{#16379}
diff --git a/webrtc/examples/peerconnection/client/linux/main.cc b/webrtc/examples/peerconnection/client/linux/main.cc
index 2982c28..4db929c 100644
--- a/webrtc/examples/peerconnection/client/linux/main.cc
+++ b/webrtc/examples/peerconnection/client/linux/main.cc
@@ -54,11 +54,7 @@
 
 int main(int argc, char* argv[]) {
   gtk_init(&argc, &argv);
-  // g_type_init API is deprecated (and does nothing) since glib 2.35.0, see:
-  // https://mail.gnome.org/archives/commits-list/2012-November/msg07809.html
-#if !GLIB_CHECK_VERSION(2, 35, 0)
-    g_type_init();
-#endif
+  g_type_init();
   // g_thread_init API is deprecated since glib 2.31.0, see release note:
   // http://mail.gnome.org/archives/gnome-announce-list/2011-October/msg00041.html
 #if !GLIB_CHECK_VERSION(2, 31, 0)