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This is a continuation of crrev.com/c/1086680 and crrev.com/c/1116400.

isFakeEntry changed the logic to not use operator "in" since Closure
compiler was failing for FilesAppEntry types:
"ERROR - Cannot use the IN operator with structs".

Bug: 846587
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I34914893d01bba43fdbcfc9e4b197031e50c662a
Reviewed-on: https://chromium-review.googlesource.com/1116517
Commit-Queue: Luciano Pacheco <lucmult@chromium.org>
Reviewed-by: Sasha Morrissey <sashab@chromium.org>
Cr-Commit-Position: refs/heads/master@{#572503}