Cleanups in remoting gn files.

remoting/remoting_enable.gni

Index: remoting/remoting_enable.gni
diff --git a/remoting/remoting_enable.gni b/remoting/remoting_enable.gni
index 0160893bfc4e370ceabd392c72852e5cdac0abbb..3b9f45e0082ea121ac96fd3c2037d01837b53e6a 100644
--- a/remoting/remoting_enable.gni
+++ b/remoting/remoting_enable.gni
@@ -3,19 +3,8 @@
 # found in the LICENSE file.
 
 import("//build/config/ui.gni")
+import("//media/media_options.gni")
 
 declare_args() {
-  enable_remoting = !is_ios && !is_chromecast
-}
-
-enable_remoting_host = false
-enable_me2me_host = false
-
-if (is_win || (is_linux && !is_chromeos && use_x11) || is_mac) {
-  enable_remoting_host = true
-  enable_me2me_host = true
-}
-
-if (is_linux && is_chromeos) {
-  enable_remoting_host = true
+  enable_remoting = !is_ios && !is_chromecast && enable_webrtc
 }