Revert "Switch RegularExpression from YARR to V8"

Source/core/platform/text/RegularExpression.h

Index: Source/core/platform/text/RegularExpression.h
diff --git a/Source/core/platform/text/RegularExpression.h b/Source/core/platform/text/RegularExpression.h
index 2911b435af07292b66d9e2eb06b99873f8aba5da..ad2dadc6fc89c8d34e0802736cd67830d9c8ad18 100644
--- a/Source/core/platform/text/RegularExpression.h
+++ b/Source/core/platform/text/RegularExpression.h
@@ -1,6 +1,5 @@
 /*
  * Copyright (C) 2003, 2008, 2009 Apple Inc. All rights reserved.
- * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -27,10 +26,11 @@
 #ifndef RegularExpression_h
 #define RegularExpression_h
 
-#include "ScopedPersistent.h"
+#include <wtf/BumpPointerAllocator.h>
 #include <wtf/Noncopyable.h>
+#include <wtf/PassOwnPtr.h>
 #include <wtf/text/WTFString.h>
-#include <v8.h>
+#include <yarr/Yarr.h>
 
 namespace WebCore {
 
@@ -46,10 +46,12 @@ public:
 
     int match(const String&, int startFrom = 0, int* matchLength = 0) const;
 
-    bool isValid() const { return !m_regex.isEmpty(); }
-
 private:
-    ScopedPersistent<v8::RegExp> m_regex;
+    PassOwnPtr<JSC::Yarr::BytecodePattern> compile(const String&, TextCaseSensitivity, MultilineMode);
+
+    unsigned m_numSubpatterns;
+    OwnPtr<JSC::Yarr::BytecodePattern> m_regExpByteCode;
+    BumpPointerAllocator m_regexAllocator;
 };
 
 } // namespace WebCore