Change network channel type to always use GCM_NETWORK_CHANNEL

sign in screen), perhaps because of push client network stopped working
from server side

Before: Invalidations stopped working on Device level (public session,
After: Invalidations works on Device level
Change-Id: I64118538057ac3185dc17cc0cacd68c18f9e2a3f
Bug: 932106
Reviewed-on: https://chromium-review.googlesource.com/c/1478793
Commit-Queue: Askar Aitzhan <askaraitzhan@google.com>
Reviewed-by: Sergey Poromov <poromov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#633754}

chrome/browser/chromeos/policy/ticl_device_settings_provider.cc

@@ -16,8 +16,7 @@ TiclDeviceSettingsProvider::~TiclDeviceSettingsProvider() {
 }
 
 bool TiclDeviceSettingsProvider::UseGCMChannel() const {
-  return base::CommandLine::ForCurrentProcess()->HasSwitch(
-      invalidation::switches::kInvalidationUseGCMChannel);
+  return true;
 }
 
 }  // namespace policy