Revert of Add CPP API for BLE advertisments.

chromeos/dbus/fake_bluetooth_le_advertising_manager_client.cc

Index: chromeos/dbus/fake_bluetooth_le_advertising_manager_client.cc
diff --git a/chromeos/dbus/fake_bluetooth_le_advertising_manager_client.cc b/chromeos/dbus/fake_bluetooth_le_advertising_manager_client.cc
index 570283239b77e3ce3d22d3d4ec28b0ed5e3cee8d..8145d1c211658a210b6c67af377cacf3c7d72481 100644
--- a/chromeos/dbus/fake_bluetooth_le_advertising_manager_client.cc
+++ b/chromeos/dbus/fake_bluetooth_le_advertising_manager_client.cc
@@ -54,6 +54,9 @@
   } else if (!currently_registered_.value().empty()) {
     error_callback.Run(bluetooth_advertising_manager::kErrorFailed,
                        "Maximum advertisements reached");
+  } else if (advertisement_object_path != currently_registered_) {
+    error_callback.Run(bluetooth_advertising_manager::kErrorAlreadyExists,
+                       "Already advertising.");
   } else {
     currently_registered_ = advertisement_object_path;
     base::MessageLoop::current()->PostTask(FROM_HERE, callback);