Revert of Rename kDisableGestureRequirementForMediaPlayback and make it a test-only flag.

media/base/media_switches.cc

Index: media/base/media_switches.cc
diff --git a/media/base/media_switches.cc b/media/base/media_switches.cc
index 1769cff8ffbccd1692a74811ee9a091887951937..571974cd77a5f13cc5d4085dac1d5f3cb2210c89 100644
--- a/media/base/media_switches.cc
+++ b/media/base/media_switches.cc
@@ -137,12 +137,6 @@
 // Default values are 150M for video and 12M for audio.
 const char kMSEAudioBufferSizeLimit[] = "mse-audio-buffer-size-limit";
 const char kMSEVideoBufferSizeLimit[] = "mse-video-buffer-size-limit";
-
-// Ignores all autoplay restrictions. It will ignore the current autoplay policy
-// and all restrictions such as playback in a background tab. It should only be
-// enabled for testing.
-const char kIgnoreAutoplayRestrictionsForTests[] =
-    "ignore-autoplay-restrictions";
 
 namespace autoplay {