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By default, on POSIX, FileEnumerator keeps track of previously
visited directories by inode. On Fuchsia, this was not working
properly because all files under the /pkg directory have inode 1.

To work around this issue, the SHOW_SYM_LINKS flag was used. This flag
makes FileEnumerator always parse through SymLinks on POSIX platforms.

Since Fuchsia does not support SymLinks, this CL makes the
SHOW_SYM_LINKS flag have no effect on Fuchsia and tweaks the
FileEnumerator behavior to never keep track of inodes on Fuchsia.

Bug: 1033230
Change-Id: I2bb7a25b3e49f394323bfb14e1e5132dda92ca12
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1967970
Commit-Queue: Fabrice de Gans-Riberi <fdegans@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Reviewed-by: Ryan Hamilton <rch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738345}