Change |use_alternative_service| not to disable Alternate Protocols.

net/http/http_stream_factory_impl.cc

Index: net/http/http_stream_factory_impl.cc
diff --git a/net/http/http_stream_factory_impl.cc b/net/http/http_stream_factory_impl.cc
index 68eb6afaf26a967b65b781ca01d5c0d8cf88950a..2a8664e51a6458ed9d087582066a943a03552c27 100644
--- a/net/http/http_stream_factory_impl.cc
+++ b/net/http/http_stream_factory_impl.cc
@@ -152,9 +152,6 @@ const HostMappingRules* HttpStreamFactoryImpl::GetHostMappingRules() const {
 
 AlternativeServiceVector HttpStreamFactoryImpl::GetAlternativeServicesFor(
     const GURL& original_url) {
-  if (!session_->params().use_alternative_services)
-    return AlternativeServiceVector();
-
   if (original_url.SchemeIs("ftp"))
     return AlternativeServiceVector();
 
@@ -166,6 +163,9 @@ AlternativeServiceVector HttpStreamFactoryImpl::GetAlternativeServicesFor(
   if (alternative_service_vector.empty())
     return AlternativeServiceVector();
 
+  const bool enable_different_host =
+      session_->params().use_alternative_services;
+
   AlternativeServiceVector enabled_alternative_service_vector;
   for (const AlternativeService& alternative_service :
        alternative_service_vector) {
@@ -176,6 +176,9 @@ AlternativeServiceVector HttpStreamFactoryImpl::GetAlternativeServicesFor(
       continue;
     }
 
+    if (origin.host() != alternative_service.host && !enable_different_host)
+      continue;
+
     // Some shared unix systems may have user home directories (like
     // http://foo.com/~mike) which allow users to emit headers.  This is a bad
     // idea already, but with Alternate-Protocol, it provides the ability for a