Rename switch to disable prefixed Encrypted Media APIs.

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 972d849bf761b41a8c140373dd89e1df71174cb2..ad035568a3690843473da7ff686148aedfa0f217 100644
--- a/media/base/media_switches.cc
+++ b/media/base/media_switches.cc
@@ -36,9 +36,6 @@ const char kForceWaveAudio[] = "force-wave-audio";
 // Set number of threads to use for video decoding.
 const char kVideoThreads[] = "video-threads";
 
-// Disables support for Encrypted Media Extensions.
-const char kDisableEncryptedMedia[] = "disable-encrypted-media";
-
 // Enables Opus playback in media elements.
 const char kEnableOpusPlayback[] = "enable-opus-playback";