GitLab

Fuchsia doesn't support file locking, i.e. there is no
base::File::Lock(), so components/filesystem was failing to compile.
Added ifdefs so File::Lock() is not used on Fuchsia.

Bug: 737802, 744893
Change-Id: I825fba49b9c6247d1b4c75ca23fce4c150344db1
Reviewed-on: https://chromium-review.googlesource.com/575288
Commit-Queue: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Kevin Marshall <kmarshall@chromium.org>
Reviewed-by: Elliot Glaysher <erg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#487347}