Clean up unused |bindings_| from FakePrivilegedHostDeviceSetter

This CL cleans up |bindings_| from FakePrivilegedHostDeviceSetter
since it's not used.

Bug: 955171
Change-Id: I35ab1100e8732aba2fe904ebb4ac7dcc40c0a0de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1939130
Commit-Queue: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: Ryan Hansberry <hansberry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720528}

chromeos/services/multidevice_setup/public/cpp/fake_privileged_host_device_setter.h

@@ -10,7 +10,6 @@
 
 #include "chromeos/services/multidevice_setup/privileged_host_device_setter_base.h"
 #include "chromeos/services/multidevice_setup/public/mojom/multidevice_setup.mojom.h"
-#include "mojo/public/cpp/bindings/binding_set.h"
 
 namespace chromeos {
 
@@ -33,8 +32,6 @@ class FakePrivilegedHostDeviceSetter : public PrivilegedHostDeviceSetterBase {
 
   std::vector<std::pair<std::string, SetHostDeviceCallback>> set_host_args_;
 
-  mojo::BindingSet<mojom::PrivilegedHostDeviceSetter> bindings_;
-
   DISALLOW_COPY_AND_ASSIGN(FakePrivilegedHostDeviceSetter);
 };