Service CreateNewWindow on the UI thread with a new mojo interface

content/common/associated_interface_provider_impl.cc

Index: content/common/associated_interface_provider_impl.cc
diff --git a/content/common/associated_interface_provider_impl.cc b/content/common/associated_interface_provider_impl.cc
index 647ba6a161407b5e698863420df35cb043c4d096..54472e4894e110ab288e2455e30bf1e686bee2df 100644
--- a/content/common/associated_interface_provider_impl.cc
+++ b/content/common/associated_interface_provider_impl.cc
@@ -3,6 +3,8 @@
 // found in the LICENSE file.
 
 #include "content/common/associated_interface_provider_impl.h"
+#include "base/callback.h"
+#include "base/run_loop.h"
 #include "mojo/public/cpp/bindings/associated_binding.h"
 
 namespace content {
@@ -59,7 +61,7 @@ void AssociatedInterfaceProviderImpl::GetInterface(
     mojo::ScopedInterfaceEndpointHandle handle) {
   mojom::AssociatedInterfaceAssociatedRequest request;
   request.Bind(std::move(handle));
-  return proxy_->GetAssociatedInterface(name, std::move(request));
+  proxy_->GetAssociatedInterface(name, std::move(request));
 }
 
 void AssociatedInterfaceProviderImpl::OverrideBinderForTesting(