Make autoplay policies no longer platform dependant.

content/child/runtime_features.cc

Index: content/child/runtime_features.cc
diff --git a/content/child/runtime_features.cc b/content/child/runtime_features.cc
index 10adbf550de0c8a50bcb68a25d8ce612a4c8d048..17f8094b1b0b4333afa797bc65132c2cfc96d5a6 100644
--- a/content/child/runtime_features.cc
+++ b/content/child/runtime_features.cc
@@ -371,12 +371,10 @@ void SetRuntimeFeaturesDefaultsAndUpdateFromArgs(
   if (base::FeatureList::IsEnabled(features::kIdleTimeSpellChecking))
     WebRuntimeFeatures::EnableFeatureFromString("IdleTimeSpellChecking", true);
 
-#if !defined(OS_ANDROID)
-  if (command_line.GetSwitchValueASCII(switches::kAutoplayPolicy) ==
-      switches::autoplay::kCrossOriginUserGestureRequiredPolicy) {
+  if (media::GetEffectiveAutoplayPolicy(command_line) !=
+      switches::autoplay::kNoUserGestureRequiredPolicy) {
     WebRuntimeFeatures::EnableAutoplayMutedVideos(true);
   }
-#endif
 
   WebRuntimeFeatures::EnableLocationHardReload(
       base::FeatureList::IsEnabled(features::kLocationHardReload));