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diff --git a/webkit/api/public/WebString.h b/webkit/api/public/WebString.h
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+/*
+ * Copyright (C) 2009 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:
+ * 
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "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 THE COPYRIGHT
+ * OWNER 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 WebString_h
+#define WebString_h
+
+#include "WebCommon.h"
+
+#if WEBKIT_IMPLEMENTATION
+namespace WebCore { class String; }
+#else
+#include <base/string16.h>
+#endif
+
+namespace WebKit {
+
+    class WebStringPrivate;
+
+    // A UTF-16 string container.  It is inexpensive to copy a WebString
+    // object.
+    //
+    // WARNING: It is not safe to pass a WebString across threads!!!
+    //
+    class WebString {
+    public:
+        ~WebString() { reset(); }
+
+        WebString() : m_private(0) { }
+
+        WebString(const WebUChar* data, size_t len) : m_private(0)
+        {
+            assign(data, len);
+        }
+
+        WebString(const WebString& s) : m_private(0) { assign(s); }
+
+        WebString& operator=(const WebString& s)
+        {
+            assign(s);
+            return *this;
+        }
+
+        WEBKIT_API void reset();
+        WEBKIT_API void assign(const WebString&);
+        WEBKIT_API void assign(const WebUChar* data, size_t len);
+
+        WEBKIT_API size_t length() const;
+        WEBKIT_API const WebUChar* data() const;
+
+        bool isEmpty() const { return length() == 0; }
+        bool isNull() const { return m_private == 0; }
+
+        WEBKIT_API static WebString fromUTF8(const char* data, size_t length);
+        WEBKIT_API static WebString fromUTF8(const char* data);
+
+#if WEBKIT_IMPLEMENTATION
+        WebString(const WebCore::String&);
+        WebString& operator=(const WebCore::String&);
+        operator WebCore::String() const;
+#else
+        WebString(const string16& s) : m_private(0)
+        {
+            assign(s.data(), s.length());
+        }
+
+        WebString& operator=(const string16& s)
+        {
+            assign(s.data(), s.length());
+            return *this;
+        }
+
+        operator string16() const
+        {
+            size_t len = length();
+            return len ? string16(data(), len) : string16();
+        }
+
+        template <class UTF8String>
+        static WebString fromUTF8(const UTF8String& s)
+        {
+            return fromUTF8(s.data(), s.length());
+        }
+#endif
+
+    private:
+        void assign(WebStringPrivate*);
+        WebStringPrivate* m_private;
+    };
+
+} // namespace WebKit
+
+#endif