Use a BitArray in RuntimeCSSEnabled instead of a Vector<bool>

Source/wtf/BitArray.h

 /*
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 16 matching lines @@
 #define BitArray_h
 
 #include <string.h>
 #include "wtf/Assertions.h"
 
 namespace WTF {
 
 template<unsigned arraySize>
 class BitArray {
 public:
-    BitArray()
+    BitArray(bool value = false)
     {
-        memset(m_data, 0, sizeof(m_data));
+        memset(m_data, value ? 0xFF : 0, sizeof(m_data));
     }
 
     void set(unsigned index)
     {
         ASSERT_WITH_SECURITY_IMPLICATION(index < arraySize);
         m_data[index / 8] |= 1 << (index & 7);
     }
 
+    void clear(unsigned index)
+    {
+        ASSERT_WITH_SECURITY_IMPLICATION(index < arraySize);
+        m_data[index / 8] &= ~(1 << (index & 7));
+    }
+
     bool get(unsigned index) const
     {
         ASSERT_WITH_SECURITY_IMPLICATION(index < arraySize);
         return !!(m_data[index / 8] & (1 << (index & 7)));
     }
 
 private:
     unsigned char m_data[arraySize / 8 + 1];
 };
 
 } // namespace WTF
 
 using WTF::BitArray;
 
 #endif // BitArray_h