[ResourceScheduler] Make throttling H2+QUIC default disabled

content/browser/loader/resource_scheduler.cc

Index: content/browser/loader/resource_scheduler.cc
diff --git a/content/browser/loader/resource_scheduler.cc b/content/browser/loader/resource_scheduler.cc
index 4625293447e5dcf42d0b7a22b7589a9a96929c6a..c977bd5cc93c0e6df64dc6664c3ff28c294f5bbc 100644
--- a/content/browser/loader/resource_scheduler.cc
+++ b/content/browser/loader/resource_scheduler.cc
@@ -37,7 +37,7 @@ namespace {
 // HTTP/1.1 resources are. Disabling this appears to have negative performance
 // impact, see https://crbug.com/655585.
 const base::Feature kPrioritySupportedRequestsDelayable{
-    "PrioritySupportedRequestsDelayable", base::FEATURE_ENABLED_BY_DEFAULT};
+    "PrioritySupportedRequestsDelayable", base::FEATURE_DISABLED_BY_DEFAULT};
 
 enum StartMode {
   START_SYNC,