Revert "Switch RegularExpression from YARR to V8"

Source/core/platform/text/RegularExpression.h

 /*
  * 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
  * 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
  *    documentation and/or other materials provided with the distribution.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 
  */
 
 #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 {
 
 enum MultilineMode {
     MultilineDisabled,
     MultilineEnabled
 };
 
 class RegularExpression {
     WTF_MAKE_FAST_ALLOCATED; WTF_MAKE_NONCOPYABLE(RegularExpression);
 public:
     RegularExpression(const String&, TextCaseSensitivity, MultilineMode = MultilineDisabled);
 
     int match(const String&, int startFrom = 0, int* matchLength = 0) const;
 
-    bool isValid() const { return !m_regex.isEmpty(); }
+private:
+    PassOwnPtr<JSC::Yarr::BytecodePattern> compile(const String&, TextCaseSensitivity, MultilineMode);
 
-private:
-    ScopedPersistent<v8::RegExp> m_regex;
+    unsigned m_numSubpatterns;
+    OwnPtr<JSC::Yarr::BytecodePattern> m_regExpByteCode;
+    BumpPointerAllocator m_regexAllocator;
 };
 
 } // namespace WebCore
 
 #endif // RegularExpression_h