Revert of Remove uses of deprecated toWebCoreStringWithUndefinedOrNullCheck(v8::Handle<v8::Value>)

Source/bindings/v8/V8Binding.h

Index: Source/bindings/v8/V8Binding.h
diff --git a/Source/bindings/v8/V8Binding.h b/Source/bindings/v8/V8Binding.h
index 40cc21bd8b9e46463bdec4ae01e6fd96baa1b0d8..49d120fdc37c8b30e1564f9181acfb077f2df353 100644
--- a/Source/bindings/v8/V8Binding.h
+++ b/Source/bindings/v8/V8Binding.h
@@ -204,6 +204,15 @@
         return stringResource;
     }
 
+    // FIXME: See the above comment.
+    inline String toWebCoreStringWithUndefinedOrNullCheck(v8::Handle<v8::Value> value)
+    {
+        V8StringResource<WithUndefinedOrNullCheck> stringResource(value);
+        if (!stringResource.prepare())
+            return String();
+        return stringResource;
+    }
+
     // Convert a string to a V8 string.
     // Return a V8 external string that shares the underlying buffer with the given
     // WebCore string. The reference counting mechanism is used to keep the