Reland of name kDisableGestureRequirementForMediaPlayback and make it a test-only flag.

content/browser/renderer_host/render_view_host_impl.cc

Index: content/browser/renderer_host/render_view_host_impl.cc
diff --git a/content/browser/renderer_host/render_view_host_impl.cc b/content/browser/renderer_host/render_view_host_impl.cc
index db981b63dbf96e5b1ed0ecef3245acdfa099c79e..f62cf8320202c8cecfe3caa4b1504b320f58ca25 100644
--- a/content/browser/renderer_host/render_view_host_impl.cc
+++ b/content/browser/renderer_host/render_view_host_impl.cc
@@ -440,8 +440,7 @@
   // is disabled with a command-line switch or the equivalent field trial is
   // is set to "Enabled".
   prefs.user_gesture_required_for_media_playback =
-      !command_line.HasSwitch(
-          switches::kDisableGestureRequirementForMediaPlayback) &&
+      !command_line.HasSwitch(switches::kIgnoreAutoplayRestrictionsForTests) &&
       command_line.GetSwitchValueASCII(switches::kAutoplayPolicy) !=
           switches::autoplay::kNoUserGestureRequiredPolicy;