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Revert "Remove unsupported perm, symlink calls for Fuchsia."

This reverts commit 52118eee.

Reason for revert: This prevents net_unittests from building, due to a dependency on these APIs in sql/connection.cc. We should consider stubbing them out to return sensible values, e.g. GetPosixPermissions returning ugo+rwx and SetPosixPermissions returning not-implemented error.

Original change's description:
> Remove unsupported perm, symlink calls for Fuchsia.
> 
> Remove unsupported perm, symlink calls for Fuchsia.
> Fuchsia's POSIX support does not extend to file permission bit or
> symbolic links. This CL conditionally removes the relevant calls from
> file_util and disables affected tests under Fuchsia builds.
> 
> R: thakis@chromium.org
> Bug: 706592
> Change-Id: Id6b68fd9a440f37debe50feb7ce3f457bbee3e4f
> Reviewed-on: https://chromium-review.googlesource.com/562901
> Reviewed-by: Nico Weber <thakis@chromium.org>
> Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#486236}

TBR=thakis@chromium.org,kmarshall@chromium.org

Change-Id: I1ce22ac0d60db6891c8264e269247deec0f29f32
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 706592
Reviewed-on: https://chromium-review.googlesource.com/570518Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#486416}