gpu: Destroy the BindingSet on the thread it's bound on.

services/ui/gpu/gpu_service.h

Index: services/ui/gpu/gpu_service.h
diff --git a/services/ui/gpu/gpu_service.h b/services/ui/gpu/gpu_service.h
index 78f7369aec6ec016ee1926ee4cbfa9faaa302ab7..7219ac38c8cfc65eca6178a8c68ba3c6439dedce 100644
--- a/services/ui/gpu/gpu_service.h
+++ b/services/ui/gpu/gpu_service.h
@@ -184,7 +184,7 @@ class GpuService : public gpu::GpuChannelManagerDelegate,
   bool in_host_process_ = false;
   base::Time start_time_;
 
-  mojo::BindingSet<mojom::GpuService> bindings_;
+  std::unique_ptr<mojo::BindingSet<mojom::GpuService>> bindings_;
 
   base::WeakPtr<GpuService> weak_ptr_;
   base::WeakPtrFactory<GpuService> weak_ptr_factory_;