Remove Net.ProxyService.* histograms.

net/proxy/proxy_service.h

Index: net/proxy/proxy_service.h
diff --git a/net/proxy/proxy_service.h b/net/proxy/proxy_service.h
index 9c11fab2f6d899bb5be8014022698216416960f9..a8972e2c1c890902475538a187f0c8f5c7e0dbc9 100644
--- a/net/proxy/proxy_service.h
+++ b/net/proxy/proxy_service.h
@@ -388,9 +388,7 @@ class NET_EXPORT ProxyService : public NetworkChangeNotifier::IPAddressObserver,
                               ProxyDelegate* proxy_delegate,
                               ProxyInfo* result,
                               int result_code,
-                              const NetLogWithSource& net_log,
-                              base::TimeTicks start_time,
-                              bool script_executed);
+                              const NetLogWithSource& net_log);
 
   // Start initialization using |fetched_config_|.
   void InitializeUsingLastFetchedConfig();