Siqi Liu b5abb87a6f Fix the potential bug for network inspector when receiving xhr objects without an "_index" property
Summary: It sometimes happens that there are already some existing `XMLHttpRequest` objects before we turn on the network inspector. So it is a must to check whether a `XMLHttpRequest` object has a property `_index` to determine if it should be tracked.

Reviewed By: davidaurelio

Differential Revision: D3635184

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