Override DevTools security summary when a Safe Browsing warning shows.

content/public/browser/security_style_explanations.h

Index: content/public/browser/security_style_explanations.h
diff --git a/content/public/browser/security_style_explanations.h b/content/public/browser/security_style_explanations.h
index b97aa6016bb95f2556380a4b7eb5ce2f12ea06b2..3033c2a10a718495275b8db71a4fda8f8af3c9df 100644
--- a/content/public/browser/security_style_explanations.h
+++ b/content/public/browser/security_style_explanations.h
@@ -27,6 +27,8 @@ namespace content {
 // levels.
 struct SecurityStyleExplanations {
   CONTENT_EXPORT SecurityStyleExplanations();
+  CONTENT_EXPORT SecurityStyleExplanations(
+      const SecurityStyleExplanations& other);
   CONTENT_EXPORT ~SecurityStyleExplanations();
 
   // True if the page was loaded over HTTPS and ran mixed (HTTP) content
@@ -63,6 +65,10 @@ struct SecurityStyleExplanations {
   // True if PKP was bypassed due to a local trust anchor.
   bool pkp_bypassed;
 
+  // User-visible summary of the security style, set only when
+  // the style cannot be determined from HTTPS status alone.
+  std::string summary;
+
   // Explanations corresponding to each security level. The embedder should
   // display explanations in the order: broken, unauthenticated, secure, info.
   std::vector<SecurityStyleExplanation> secure_explanations;