Provide a better way of injecting extra diagnostics in feedbacks

chrome/browser/supervised_user/supervised_user_interstitial.cc

Index: chrome/browser/supervised_user/supervised_user_interstitial.cc
diff --git a/chrome/browser/supervised_user/supervised_user_interstitial.cc b/chrome/browser/supervised_user/supervised_user_interstitial.cc
index 8765cd4d8844ca6323b36f04111de50aa61398d1..ca2da83d5275a8ef2d197f77a8c215e58493c8a4 100644
--- a/chrome/browser/supervised_user/supervised_user_interstitial.cc
+++ b/chrome/browser/supervised_user/supervised_user_interstitial.cc
@@ -262,7 +262,8 @@ void SupervisedUserInterstitial::CommandReceived(const std::string& command) {
 #else
     chrome::ShowFeedbackPage(chrome::FindBrowserWithWebContents(web_contents_),
                              chrome::kFeedbackSourceSupervisedUserInterstitial,
-                             message, std::string() /* category_tag */);
+                             message, std::string() /* category_tag */,
+                             std::string() /* extra_diagnostics */);
 #endif
     return;
   }