second stage

content/public/common/content_features.cc

Index: content/public/common/content_features.cc
diff --git a/content/public/common/content_features.cc b/content/public/common/content_features.cc
index 94b685d185a2b36400d5cdc6be9021103263195e..8a7d5ed27415e3d76347167320f437160744a427 100644
--- a/content/public/common/content_features.cc
+++ b/content/public/common/content_features.cc
@@ -117,6 +117,10 @@ const base::Feature kMemoryCoordinator {
   "MemoryCoordinator", base::FEATURE_DISABLED_BY_DEFAULT
 };
 
+// Causes the implementations of MimeHandlerViews to use out-of-process iframes.
+const base::Feature kMimeHandlerViewCrossProcessFrames{
+    "MimeHandlerViewCrossProcessFrames", base::FEATURE_DISABLED_BY_DEFAULT};
+
 // Kill switch for Web Notification content images.
 const base::Feature kNotificationContentImage{"NotificationContentImage",
                                               base::FEATURE_ENABLED_BY_DEFAULT};