diff --git a/dom/events/KeyNameList.h b/dom/events/KeyNameList.h
index 26940c93f84a..2cb688ac6dae 100644
--- a/dom/events/KeyNameList.h
+++ b/dom/events/KeyNameList.h
@@ -351,10 +351,9 @@ DEFINE_KEYNAME_WITH_SAME_NAME(Subtitle)
 // DEFINE_KEYNAME_WITH_SAME_NAME(Wink)
 DEFINE_KEYNAME_WITH_SAME_NAME(Zoom) // Rename to ZoomToggle
 
-DEFINE_KEYNAME_WITH_SAME_NAME(UpLeft)
-DEFINE_KEYNAME_WITH_SAME_NAME(UpRight)
-DEFINE_KEYNAME_WITH_SAME_NAME(DownLeft)
-DEFINE_KEYNAME_WITH_SAME_NAME(DownRight)
+/******************************************************************************
+ * Deprecated
+ ******************************************************************************/
 DEFINE_KEYNAME_WITH_SAME_NAME(DeadGrave)
 DEFINE_KEYNAME_WITH_SAME_NAME(DeadAcute)
 DEFINE_KEYNAME_WITH_SAME_NAME(DeadCircumflex)
@@ -371,10 +370,6 @@ DEFINE_KEYNAME_WITH_SAME_NAME(DeadOgonek)
 DEFINE_KEYNAME_WITH_SAME_NAME(DeadIota)
 DEFINE_KEYNAME_WITH_SAME_NAME(DeadVoicedSound)
 DEFINE_KEYNAME_WITH_SAME_NAME(DeadSemivoicedSound)
-DEFINE_KEYNAME_WITH_SAME_NAME(MediaTrackSkip)
-DEFINE_KEYNAME_WITH_SAME_NAME(MediaTrackStart)
-DEFINE_KEYNAME_WITH_SAME_NAME(MediaTrackEnd)
-DEFINE_KEYNAME_WITH_SAME_NAME(DisplayWide)
 
 #undef DEFINE_KEYNAME_WITH_SAME_NAME
 #undef DEFINE_KEYNAME_INTERNAL
diff --git a/widget/shared/NativeKeyToDOMKeyName.h b/widget/shared/NativeKeyToDOMKeyName.h
index 491a0e60239d..5ddf5ffab8b0 100644
--- a/widget/shared/NativeKeyToDOMKeyName.h
+++ b/widget/shared/NativeKeyToDOMKeyName.h
@@ -997,15 +997,9 @@ KEY_MAP_ANDROID (Subtitle, AKEYCODE_CAPTIONS)
 KEY_MAP_WIN     (Zoom, VK_ZOOM)
 KEY_MAP_QT      (Zoom, Qt::Key_Zoom)
 
-
-// UpLeft
-
-// UpRight
-
-// DownLeft
-
-// DownRight
-
+/******************************************************************************
+ * Deplicated
+ ******************************************************************************/
 // DeadGrave
 KEY_MAP_GTK     (DeadGrave, GDK_dead_grave)
 KEY_MAP_QT      (DeadGrave, Qt::Key_Dead_Grave)
@@ -1070,14 +1064,6 @@ KEY_MAP_QT      (DeadVoicedSound, Qt::Key_Dead_Voiced_Sound)
 KEY_MAP_GTK     (DeadSemivoicedSound, GDK_dead_semivoiced_sound)
 KEY_MAP_QT      (DeadSemivoicedSound, Qt::Key_Dead_Semivoiced_Sound)
 
-// MediaTrackSkip
-
-// MediaTrackStart
-
-// MediaTrackEnd
-
-// DisplayWide
-
 #undef KEY_MAP_WIN
 #undef KEY_MAP_WIN_JPN
 #undef KEY_MAP_WIN_KOR