Remove FillDOMInThreatDetails finch feature.

chrome/browser/safe_browsing/threat_details.h

Index: chrome/browser/safe_browsing/threat_details.h
diff --git a/chrome/browser/safe_browsing/threat_details.h b/chrome/browser/safe_browsing/threat_details.h
index 55a501e7ace4c5597821874e19c44675b1cec62e..d1a8aec73b6213b1213646575c4300f69c6ed4e4 100644
--- a/chrome/browser/safe_browsing/threat_details.h
+++ b/chrome/browser/safe_browsing/threat_details.h
@@ -17,7 +17,6 @@
 #include <vector>
 
 #include "base/containers/hash_tables.h"
-#include "base/feature_list.h"
 #include "base/gtest_prod_util.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
@@ -37,8 +36,6 @@ struct SafeBrowsingHostMsg_ThreatDOMDetails_Node;
 
 namespace safe_browsing {
 
-extern const base::Feature kFillDOMInThreatDetails;
-
 // Maps a URL to its Resource.
 class ThreatDetailsCacheCollector;
 class ThreatDetailsRedirectsCollector;