[net/proxy] Usage of ThreadTaskRunnerHandle & SingleThreadTaskRunner instead of MLP

net/proxy/network_delegate_error_observer.h

Index: net/proxy/network_delegate_error_observer.h
diff --git a/net/proxy/network_delegate_error_observer.h b/net/proxy/network_delegate_error_observer.h
index 6fad5780175974502b1a268806d010f6a2a8a750..2ae649c68a7bd767e557927b6d2f575290b891d1 100644
--- a/net/proxy/network_delegate_error_observer.h
+++ b/net/proxy/network_delegate_error_observer.h
@@ -10,7 +10,7 @@
 #include "net/proxy/proxy_resolver_error_observer.h"
 
 namespace base {
-class MessageLoopProxy;
+class SingleThreadTaskRunner;
 }
 
 namespace net {
@@ -23,7 +23,7 @@ class NET_EXPORT_PRIVATE NetworkDelegateErrorObserver
     : public ProxyResolverErrorObserver {
  public:
   NetworkDelegateErrorObserver(NetworkDelegate* network_delegate,
-                               base::MessageLoopProxy* origin_loop);
+                               base::SingleThreadTaskRunner* origin_runner);
   ~NetworkDelegateErrorObserver() override;
 
   // ProxyResolverErrorObserver implementation.