[DevTools] Network.emulateNetworkConditions now affects NetworkStateNotifier.

chrome/browser/devtools/devtools_network_protocol_handler.cc

Index: chrome/browser/devtools/devtools_network_protocol_handler.cc
diff --git a/chrome/browser/devtools/devtools_network_protocol_handler.cc b/chrome/browser/devtools/devtools_network_protocol_handler.cc
index 8bd44d9bb4e11e1881c9caf756c090a96ea1fc5e..2c39ad7ace6f3fc683d916d49f96688ab821a8db 100644
--- a/chrome/browser/devtools/devtools_network_protocol_handler.cc
+++ b/chrome/browser/devtools/devtools_network_protocol_handler.cc
@@ -92,9 +92,7 @@ DevToolsNetworkProtocolHandler::EmulateNetworkConditions(
                                     upload_throughput));
 
   UpdateNetworkState(agent_host, std::move(conditions));
-
-  std::unique_ptr<base::DictionaryValue> result(new base::DictionaryValue());
-  return DevToolsProtocol::CreateSuccessResponse(command_id, std::move(result));
+  return nullptr; // Fall-through.
 }
 
 void DevToolsNetworkProtocolHandler::UpdateNetworkState(