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 ec86af9a578d3d2b71bb1ec2d732211c8dd3e9c4..dd31dfd266a19afc646e34fc94345035ef7e980c 100644
--- a/content/child/runtime_features.cc
+++ b/content/child/runtime_features.cc
@@ -16,6 +16,7 @@
 #include "content/public/common/content_features.h"
 #include "content/public/common/content_switches.h"
 #include "media/base/media_switches.h"
+#include "media/base/media_util.h"
 #include "services/device/public/cpp/device_features.h"
 #include "third_party/WebKit/public/web/WebRuntimeFeatures.h"
 #include "ui/gl/gl_switches.h"
@@ -383,12 +384,10 @@ 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
 
   // Enable explicitly enabled features, and then disable explicitly disabled
   // ones.