Remove all traces of deprecated Get/SetReleaseTrack calls.

chromeos/dbus/fake_update_engine_client.cc

Index: chromeos/dbus/fake_update_engine_client.cc
diff --git a/chromeos/dbus/fake_update_engine_client.cc b/chromeos/dbus/fake_update_engine_client.cc
index ff82fdc39678e7152585edb54564b4ab2f5c2530..b9f40a28c1b2ff94454586a106c5411ce11fc2da 100644
--- a/chromeos/dbus/fake_update_engine_client.cc
+++ b/chromeos/dbus/fake_update_engine_client.cc
@@ -33,13 +33,6 @@ void FakeUpdateEngineClient::RebootAfterUpdate() {
   reboot_after_update_call_count_++;
 }
 
-void FakeUpdateEngineClient::SetReleaseTrack(const std::string& track) {
-}
-
-void FakeUpdateEngineClient::GetReleaseTrack(
-    const GetReleaseTrackCallback& callback) {
-}
-
 UpdateEngineClient::Status FakeUpdateEngineClient::GetLastStatus() {
   if (status_queue_.empty())
     return default_status_;