login_manager: Don't chown() timezone symlink.

Remove a call to chown() the symlink at
/var/lib/timezone/localtime after creating it. chown()
dereferences symlinks, and this one points to
/usr/share/zoneinfo/US/Pacific on the readonly partition.

BUG=chromium:380957
TEST=session_manager works after removing the
     /var/lib/timezone directory or the
     /var/lib/timezone/localtime symlink

Change-Id: Ic908cb67dd1df0cf1e3d1278f92f4399c63e6875
Reviewed-on: https://chromium-review.googlesource.com/202601
Commit-Queue: Daniel Erat <derat@chromium.org>
Tested-by: Daniel Erat <derat@chromium.org>
Reviewed-by: Chris Masone <cmasone@chromium.org>
diff --git a/chrome_setup.cc b/chrome_setup.cc
index 46c5642..3aac03b 100644
--- a/chrome_setup.cc
+++ b/chrome_setup.cc
@@ -138,7 +138,6 @@
     CHECK(util::EnsureDirectoryExists(timezone_file.DirName(), uid, gid, 0700));
     CHECK(base::CreateSymbolicLink(
         base::FilePath("/usr/share/zoneinfo/US/Pacific"), timezone_file));
-    CHECK(util::SetPermissions(timezone_file, uid, gid, 0644));
   }
 
   // Tell Chrome where to write logging messages before the user logs in.