[fuchsia] remove Fuchsia-specific code in MoveFileOrDirectory

ZX-1729 has been fixed upstream

Change-Id: Ia9c55b13169db650eb4ca0562434ae19a6f44eaf
Reviewed-on: https://chromium-review.googlesource.com/c/1366638
Reviewed-by: Scott Graham <scottmg@chromium.org>
Commit-Queue: Francois Rousseau <frousseau@google.com>
diff --git a/util/file/filesystem_posix.cc b/util/file/filesystem_posix.cc
index c2234da..b1f19f6 100644
--- a/util/file/filesystem_posix.cc
+++ b/util/file/filesystem_posix.cc
@@ -65,14 +65,6 @@
 
 bool MoveFileOrDirectory(const base::FilePath& source,
                          const base::FilePath& dest) {
-#if defined(OS_FUCHSIA)
-  // Fuchsia fails and sets errno to EINVAL if source and dest are the same.
-  // Upstream bug is ZX-1729.
-  if (!source.empty() && source == dest) {
-    return true;
-  }
-#endif  // OS_FUCHSIA
-
   if (rename(source.value().c_str(), dest.value().c_str()) != 0) {
     PLOG(ERROR) << "rename " << source.value().c_str() << ", "
                 << dest.value().c_str();