Disable use of libevent under Fuchsia.

Bug: chromium:808287
Change-Id: I1c29c5f2d13ad06904724fd95d476b23ae7097ac
Reviewed-on: https://webrtc-review.googlesource.com/50520
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Tommi <tommi@webrtc.org>
Commit-Queue: Tommi <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21994}
diff --git a/webrtc.gni b/webrtc.gni
index 5dc2675..aeac552 100644
--- a/webrtc.gni
+++ b/webrtc.gni
@@ -171,7 +171,7 @@
   # Enable libevent task queues on platforms that support it.
   # rtc_link_task_queue_impl must be set to true for this to
   # have an effect.
-  if (is_win || is_mac || is_ios || is_nacl) {
+  if (is_win || is_mac || is_ios || is_nacl || is_fuchsia) {
     rtc_enable_libevent = false
     rtc_build_libevent = false
   } else {