Remove prefixed EME.

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 1ad1981e747d47b6a7888bd614a4e2d5be45e928..c7647a6e424b407fc42a7bf8ecc5cd63cbb08579 100644
--- a/content/child/runtime_features.cc
+++ b/content/child/runtime_features.cc
@@ -34,7 +34,6 @@ static void SetRuntimeFeatureDefaultsForPlatform() {
   // MSE/EME implementation needs Android MediaCodec API.
   if (!media::MediaCodecUtil::IsMediaCodecAvailable()) {
     WebRuntimeFeatures::enableMediaSource(false);
-    WebRuntimeFeatures::enablePrefixedEncryptedMedia(false);
     WebRuntimeFeatures::enableEncryptedMedia(false);
   }
 
@@ -105,12 +104,6 @@ void SetRuntimeFeaturesDefaultsAndUpdateFromArgs(
   if (command_line.HasSwitch(switches::kDisableSpeechAPI))
     WebRuntimeFeatures::enableScriptedSpeech(false);
 
-  if (command_line.HasSwitch(switches::kDisableEncryptedMedia))
-    WebRuntimeFeatures::enableEncryptedMedia(false);
-
-  if (command_line.HasSwitch(switches::kEnablePrefixedEncryptedMedia))
-    WebRuntimeFeatures::enablePrefixedEncryptedMedia(true);
-
   if (command_line.HasSwitch(switches::kDisableFileSystem))
     WebRuntimeFeatures::enableFileSystem(false);