Mojo C++ bindings: remove usage of AssociatedGroup from content/

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 43421078dd4cd99f17167bb0f9d3fbabd77ad57b..7284e43549e154a8820e28aad924b087f1b5866f 100644
--- a/content/common/associated_interface_provider_impl.cc
+++ b/content/common/associated_interface_provider_impl.cc
@@ -62,10 +62,6 @@ void AssociatedInterfaceProviderImpl::GetInterface(
   return proxy_->GetAssociatedInterface(name, std::move(request));
 }
 
-mojo::AssociatedGroup* AssociatedInterfaceProviderImpl::GetAssociatedGroup() {
-  return proxy_.associated_group();
-}
-
 void AssociatedInterfaceProviderImpl::OverrideBinderForTesting(
     const std::string& name,
     const base::Callback<void(mojo::ScopedInterfaceEndpointHandle)>& binder) {