Restore RuntimeEnabled=PrefixedEncryptedMedia to MediaKeyError.idl.

Source/web/WebRuntimeFeatures.cpp

Index: Source/web/WebRuntimeFeatures.cpp
diff --git a/Source/web/WebRuntimeFeatures.cpp b/Source/web/WebRuntimeFeatures.cpp
index a10025ec60617b5d5e410ead33467e63c1514278..426eede2123bf7679ecdbd16b5cf22fcb31e1f45 100644
--- a/Source/web/WebRuntimeFeatures.cpp
+++ b/Source/web/WebRuntimeFeatures.cpp
@@ -83,10 +83,6 @@ void WebRuntimeFeatures::enableDisplayList2dCanvas(bool enable)
 void WebRuntimeFeatures::enableEncryptedMedia(bool enable)
 {
     RuntimeEnabledFeatures::setEncryptedMediaEnabled(enable);
-    // FIXME: Hack to allow MediaKeyError to be enabled for either version.
-    RuntimeEnabledFeatures::setEncryptedMediaAnyVersionEnabled(
-        RuntimeEnabledFeatures::encryptedMediaEnabled()
-        || RuntimeEnabledFeatures::prefixedEncryptedMediaEnabled());
 }
 
 bool WebRuntimeFeatures::isEncryptedMediaEnabled()
@@ -97,10 +93,6 @@ bool WebRuntimeFeatures::isEncryptedMediaEnabled()
 void WebRuntimeFeatures::enablePrefixedEncryptedMedia(bool enable)
 {
     RuntimeEnabledFeatures::setPrefixedEncryptedMediaEnabled(enable);
-    // FIXME: Hack to allow MediaKeyError to be enabled for either version.
-    RuntimeEnabledFeatures::setEncryptedMediaAnyVersionEnabled(
-        RuntimeEnabledFeatures::encryptedMediaEnabled()
-        || RuntimeEnabledFeatures::prefixedEncryptedMediaEnabled());
 }
 
 bool WebRuntimeFeatures::isPrefixedEncryptedMediaEnabled()