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ElementKind.FILE will be used in search.findElementReferences 1. In the 'element' field of responce when a URI is at the given offset. 2. In the only element of the 'path' field of SearchResult(s) for URI references to a URI or a library identifier. R=brianwilkerson@google.com BUG= Review URL: https://codereview.chromium.org/1409333002 .