Can't open <select> popup with an <option> text including "</script>".

Source/core/page/PagePopupClient.cpp

Index: Source/core/page/PagePopupClient.cpp
diff --git a/Source/core/page/PagePopupClient.cpp b/Source/core/page/PagePopupClient.cpp
index 68ba3e91cd07df2edd39cfb857051de8a6025381..ddd4e8401bc4f3491a96d1588a2ac1d5d1b1c383 100644
--- a/Source/core/page/PagePopupClient.cpp
+++ b/Source/core/page/PagePopupClient.cpp
@@ -50,6 +50,10 @@ void PagePopupClient::addJavaScriptString(const String& str, SharedBuffer* data)
         } else if (str[i] == '\\' || str[i] == '"') {
             builder.append('\\');
             builder.append(str[i]);
+        } else if (str[i] == '<') {
+            // Need to avoid to add "</script>" because the resultant string is
+            // typically embedded in <script>.
+            builder.append("\\x3C");
         } else {
             builder.append(str[i]);
         }