Add kill switch for Notification images

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 66d6781495a439ab1627ee7393008df9a4c96865..44792a9969f326792d3e47ede98e4967fe1cc4ea 100644
--- a/content/child/runtime_features.cc
+++ b/content/child/runtime_features.cc
@@ -89,6 +89,9 @@ void SetRuntimeFeaturesDefaultsAndUpdateFromArgs(
     WebRuntimeFeatures::enablePushMessaging(false);
   }
 
+  if (!base::FeatureList::IsEnabled(features::kNotificationContentImage))
+    WebRuntimeFeatures::enableNotificationContentImage(false);
+
   // For the time being, enable wasm serialization when wasm is enabled,
   // since the whole wasm space is experimental. We have the flexibility
   // to decouple the two.