[NTP::PhysicalWeb] Disable feature by default.

components/ntp_snippets/features.cc

Index: components/ntp_snippets/features.cc
diff --git a/components/ntp_snippets/features.cc b/components/ntp_snippets/features.cc
index 85b325f5f3e62ef27b622b45b784bb7796a1f5bc..49c209742d3e7eadc14adabf5e6851712c052f64 100644
--- a/components/ntp_snippets/features.cc
+++ b/components/ntp_snippets/features.cc
@@ -32,7 +32,7 @@ const base::Feature kIncreasedVisibility{
     "NTPSnippetsIncreasedVisibility", base::FEATURE_ENABLED_BY_DEFAULT};
 
 const base::Feature kPhysicalWebPageSuggestionsFeature{
-    "NTPPhysicalWebPageSuggestions", base::FEATURE_ENABLED_BY_DEFAULT};
+    "NTPPhysicalWebPageSuggestions", base::FEATURE_DISABLED_BY_DEFAULT};
 
 const base::Feature kContentSuggestionsSource{
     "NTPSnippets", base::FEATURE_ENABLED_BY_DEFAULT};