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

content/child/resource_dispatcher_unittest.cc

Index: content/child/resource_dispatcher_unittest.cc
diff --git a/content/child/resource_dispatcher_unittest.cc b/content/child/resource_dispatcher_unittest.cc
index 758376de25aeaf3d28eff54df0b259d855081d03..d1462e3306a75c8b14139fada5ca69deb0b8ff53 100644
--- a/content/child/resource_dispatcher_unittest.cc
+++ b/content/child/resource_dispatcher_unittest.cc
@@ -236,7 +236,7 @@ class ResourceDispatcherTest : public testing::Test, public IPC::Sender {
         new TestRequestPeer(dispatcher(), peer_context));
     int request_id = dispatcher()->StartAsync(
         std::move(request), 0, nullptr, url::Origin(), std::move(peer),
-        blink::WebURLRequest::LoadingIPCType::ChromeIPC, nullptr, nullptr);
+        blink::WebURLRequest::LoadingIPCType::ChromeIPC, nullptr);
     peer_context->request_id = request_id;
     return request_id;
   }