--- a/layout/style/nsCSSProps.cpp
+++ b/layout/style/nsCSSProps.cpp
@@ -62,44 +62,16 @@ static const char* const kCSSRawFontDesc
 };
 
 static const char* const kCSSRawCounterDescs[] = {
 #define CSS_COUNTER_DESC(name_, method_) #name_,
 #include "nsCSSCounterDescList.h"
 #undef CSS_COUNTER_DESC
 };
 
-static const char* const kCSSRawPredefinedCounterStyles[] = {
-  "none",
-  // 6 Simple Predefined Counter Styles
-  // 6.1 Numeric
-  "decimal", "decimal-leading-zero", "arabic-indic", "armenian",
-  "upper-armenian", "lower-armenian", "bengali", "cambodian", "khmer",
-  "cjk-decimal", "devanagari", "georgian", "gujarati", "gurmukhi", "hebrew",
-  "kannada", "lao", "malayalam", "mongolian", "myanmar", "oriya", "persian",
-  "lower-roman", "upper-roman", "tamil", "telugu", "thai", "tibetan",
-  // 6.2 Alphabetic
-  "lower-alpha", "lower-latin", "upper-alpha", "upper-latin",
-  "cjk-earthly-branch", "cjk-heavenly-stem", "lower-greek",
-  "hiragana", "hiragana-iroha", "katakana", "katakana-iroha",
-  // 6.3 Symbolic
-  "disc", "circle", "square", "disclosure-open", "disclosure-closed",
-  // 7 Complex Predefined Counter Styles
-  // 7.1 Longhand East Asian Counter Styles
-  // 7.1.1 Japanese
-  "japanese-informal", "japanese-formal",
-  // 7.1.2 Korean
-  "korean-hangul-formal", "korean-hanja-informal", "korean-hanja-formal",
-  // 7.1.3 Chinese
-  "simp-chinese-informal", "simp-chinese-formal",
-  "trad-chinese-informal", "trad-chinese-formal", "cjk-ideographic",
-  // 7.2 Ethiopic Numeric Counter Style
-  "ethiopic-numeric"
-};
-
 // We need eCSSAliasCount so we can make gAliases nonzero size when there
 // are no aliases.
 enum {
   eCSSAliasCount = eCSSProperty_COUNT_with_aliases - eCSSProperty_COUNT
 };
 
 // The names are in kCSSRawProperties.
 static nsCSSPropertyID gAliases[eCSSAliasCount != 0 ? eCSSAliasCount : 1] = {
@@ -387,23 +359,16 @@ nsCSSProps::GetStringValue(nsCSSCounterD
   if (gCounterDescTable) {
     return gCounterDescTable->GetStringValue(int32_t(aCounterDesc));
   } else {
     static nsDependentCString sNullStr("");
     return sNullStr;
   }
 }
 
-const char* const*
-nsCSSProps::GetListStyleTypes(int32_t *aLength)
-{
-  *aLength = ArrayLength(kCSSRawPredefinedCounterStyles);
-  return kCSSRawPredefinedCounterStyles;
-}
-
 /***************************************************************************/
 
 const KTableEntry nsCSSProps::kAnimationDirectionKTable[] = {
   { eCSSKeyword_normal, static_cast<uint32_t>(dom::PlaybackDirection::Normal) },
   { eCSSKeyword_reverse, static_cast<uint32_t>(dom::PlaybackDirection::Reverse) },
   { eCSSKeyword_alternate, static_cast<uint32_t>(dom::PlaybackDirection::Alternate) },
   { eCSSKeyword_alternate_reverse, static_cast<uint32_t>(dom::PlaybackDirection::Alternate_reverse) },
   { eCSSKeyword_UNKNOWN, -1 }

--- a/layout/style/nsCSSProps.h
+++ b/layout/style/nsCSSProps.h
@@ -253,20 +253,16 @@ public:
     {
       return true;
     }
     return false;
   }
 
 public:
 
-  // Return an array of possible list style types, and the length of
-  // the array.
-  static const char* const* GetListStyleTypes(int32_t *aLength);
-
 // Storing the enabledstate_ value in an nsCSSPropertyID variable is a small hack
 // to avoid needing a separate variable declaration for its real type
 // (CSSEnabledState), which would then require using a block and
 // therefore a pair of macros by consumers for the start and end of the loop.
 #define CSSPROPS_FOR_SHORTHAND_SUBPROPERTIES(it_, prop_, enabledstate_)   \
   for (const nsCSSPropertyID *it_ = nsCSSProps::SubpropertyEntryFor(prop_), \
                             es_ = (nsCSSPropertyID)((enabledstate_) |       \
                                                   CSSEnabledState(0));    \