Remove support for Alt-Svc/Alternate Protocol Probability

chrome/browser/io_thread.cc

Index: chrome/browser/io_thread.cc
diff --git a/chrome/browser/io_thread.cc b/chrome/browser/io_thread.cc
index 11575c2a07a2bbecd9730853d6a3d31ebe15e34f..1e1979b6175dee05ff47739aff66749f4e76de8e 100644
--- a/chrome/browser/io_thread.cc
+++ b/chrome/browser/io_thread.cc
@@ -1097,8 +1097,6 @@ void IOThread::InitializeNetworkSessionParamsFromGlobals(
       &params->parse_alternative_services);
   globals.enable_alternative_service_with_different_host.CopyToIfSet(
       &params->enable_alternative_service_with_different_host);
-  globals.alternative_service_probability_threshold.CopyToIfSet(
-      &params->alternative_service_probability_threshold);
 
   globals.enable_npn.CopyToIfSet(&params->enable_npn);
 
@@ -1325,14 +1323,6 @@ void IOThread::ConfigureQuicGlobals(
     globals->quic_supported_versions.set(supported_versions);
   }
 
-  double threshold = GetAlternativeProtocolProbabilityThreshold(
-      command_line, quic_trial_params);
-  if (threshold >=0 && threshold <= 1) {
-    globals->alternative_service_probability_threshold.set(threshold);
-    globals->http_server_properties->SetAlternativeServiceProbabilityThreshold(
-        threshold);
-  }
-
   if (command_line.HasSwitch(switches::kOriginToForceQuicOn)) {
     net::HostPortPair quic_origin =
         net::HostPortPair::FromString(
@@ -1410,39 +1400,6 @@ net::QuicTagVector IOThread::GetQuicConnectionOptions(
   return net::QuicUtils::ParseQuicConnectionOptions(it->second);
 }
 
-double IOThread::GetAlternativeProtocolProbabilityThreshold(
-    const base::CommandLine& command_line,
-    const VariationParameters& quic_trial_params) {
-  double value;
-  if (command_line.HasSwitch(
-          switches::kAlternativeServiceProbabilityThreshold)) {
-    if (base::StringToDouble(
-            command_line.GetSwitchValueASCII(
-                switches::kAlternativeServiceProbabilityThreshold),
-            &value)) {
-      return value;
-    }
-  }
-  if (command_line.HasSwitch(switches::kEnableQuic)) {
-    return 0;
-  }
-  // TODO(bnc): Remove when new parameter name rolls out and server
-  // configuration is changed.
-  if (base::StringToDouble(
-          GetVariationParam(quic_trial_params,
-                            "alternate_protocol_probability_threshold"),
-          &value)) {
-    return value;
-  }
-  if (base::StringToDouble(
-          GetVariationParam(quic_trial_params,
-                            "alternative_service_probability_threshold"),
-          &value)) {
-    return value;
-  }
-  return -1;
-}
-
 bool IOThread::ShouldQuicAlwaysRequireHandshakeConfirmation(
     const VariationParameters& quic_trial_params) {
   return base::LowerCaseEqualsASCII(