Remove another DCHECK(UID != 0) from Mac remoting Me2Me host.

A similar DCHECK was removed in
http://crrev.com/0a0c3a85f4eeb668acc87dbc575405c6026971a1

The check is unnecessary, and is a no-op in release builds. The host
is meant to run as root for the login screen when curtain-mode is not
enabled.

Bug: 1020739
Change-Id: I5f764611b745ce58c47353b63678fbbadb3a68f3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2037466
Commit-Queue: Lambros Lambrou <lambroslambrou@chromium.org>
Commit-Queue: Jamie Walch <jamiewalch@chromium.org>
Auto-Submit: Lambros Lambrou <lambroslambrou@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738375}

remoting/host/remoting_me2me_host.cc

@@ -494,9 +494,6 @@ HostProcess::~HostProcess() {
 
 bool HostProcess::InitWithCommandLine(const base::CommandLine* cmd_line) {
 #if defined(OS_MACOSX)
-  // Ensure we are not running as root (i.e. at the login screen).
-  DCHECK_NE(getuid(), 0U);
-
   if (cmd_line->HasSwitch(kCheckAccessibilityPermissionSwitchName)) {
     checking_permission_state_ = true;
     permission_granted_ = mac::CanInjectInput();