Revert of Let features::kScrollAnchoring disable the Blink REF.

content/child/runtime_features.cc

Index: content/child/runtime_features.cc
diff --git a/content/child/runtime_features.cc b/content/child/runtime_features.cc
index 4253a37caf19450bd583538567bf673d18236f2f..487fc375e170d4022cd337d57c1fdd0e932dcaaa 100644
--- a/content/child/runtime_features.cc
+++ b/content/child/runtime_features.cc
@@ -230,8 +230,8 @@
   if (command_line.HasSwitch(switches::kEnableWebFontsInterventionTrigger))
     WebRuntimeFeatures::enableWebFontsInterventionTrigger(true);
 
-  WebRuntimeFeatures::enableScrollAnchoring(
-      base::FeatureList::IsEnabled(features::kScrollAnchoring));
+  if (base::FeatureList::IsEnabled(features::kScrollAnchoring))
+    WebRuntimeFeatures::enableScrollAnchoring(true);
 
   if (command_line.HasSwitch(switches::kEnableSlimmingPaintV2))
     WebRuntimeFeatures::enableSlimmingPaintV2(true);