--- a/layout/style/nsCSSPseudoClasses.cpp
+++ b/layout/style/nsCSSPseudoClasses.cpp
@@ -39,24 +39,26 @@ static const nsStaticAtom CSSPseudoClass
   NS_STATIC_ATOM(name_##_pseudo_class_buffer, &sPseudoClass_##name_),
 #include "nsCSSPseudoClassList.h"
 #undef CSS_PSEUDO_CLASS
 };
 
 // Flags data for each of the pseudo-classes, which must be separate
 // from the previous array since there's no place for it in
 // nsStaticAtom.
-static const uint32_t CSSPseudoClasses_flags[] = {
+/* static */ const uint32_t
+nsCSSPseudoClasses::kPseudoClassFlags[Type::Count] = {
 #define CSS_PSEUDO_CLASS(name_, value_, flags_, pref_) \
   flags_,
 #include "nsCSSPseudoClassList.h"
 #undef CSS_PSEUDO_CLASS
 };
 
-static bool sPseudoClassEnabled[] = {
+/* static */ bool
+nsCSSPseudoClasses::sPseudoClassEnabled[Type::Count] = {
 // If the pseudo class has any "ENABLED_IN" flag set, it is disabled by
 // default. Note that, if a pseudo class has pref, whatever its default
 // value is, it'll later be changed in nsCSSPseudoClasses::AddRefAtoms()
 // If the pseudo class has "ENABLED_IN" flags but doesn't have a pref,
 // it is an internal pseudo class which is disabled elsewhere.
 #define IS_ENABLED_BY_DEFAULT(flags_) \
   (!((flags_) & CSS_PSEUDO_CLASS_ENABLED_MASK))
 #define CSS_PSEUDO_CLASS(name_, value_, flags_, pref_) \
@@ -139,13 +141,13 @@ nsCSSPseudoClasses::IsUserActionPseudoCl
          aType == Type::active ||
          aType == Type::focus;
 }
 
 /* static */ uint32_t
 nsCSSPseudoClasses::FlagsForPseudoClass(const Type aType)
 {
   size_t index = static_cast<size_t>(aType);
-  NS_ASSERTION(index < ArrayLength(CSSPseudoClasses_flags),
-               "argument must be a pseudo-class");
-  return CSSPseudoClasses_flags[index];
+  MOZ_ASSERT(index < ArrayLength(kPseudoClassFlags),
+             "argument must be a pseudo-class");
+  return kPseudoClassFlags[index];
 }
 

--- a/layout/style/nsCSSPseudoClasses.h
+++ b/layout/style/nsCSSPseudoClasses.h
@@ -61,11 +61,14 @@ public:
   }
   static bool IsUserActionPseudoClass(Type aType);
 
   // Should only be used on types other than Count and NotPseudoClass
   static void PseudoTypeToString(Type aType, nsAString& aString);
 
 private:
   static uint32_t FlagsForPseudoClass(const Type aType);
+
+  static const uint32_t kPseudoClassFlags[Type::Count];
+  static bool sPseudoClassEnabled[Type::Count];
 };
 
 #endif /* nsCSSPseudoClasses_h___ */