Add certificate error handling to devtools.

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index 01a810115cad34d45f09f089116e46209c11b174..70a34139ac8750793e09105459f256cd3a18b704 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -1467,6 +1467,20 @@ void WebContentsImpl::DidChangeVisibleSecurityState() {
   }
 }
 
+bool WebContentsImpl::NotifyCertificateError(
+    int cert_error,
+    const GURL& request_url,
+    base::Callback<void(content::CertificateRequestResultType)> callback) {
+  bool handled = false;
+  for (auto& observer : observers_) {
+    if (observer.NotifyCertificateError(cert_error, request_url, callback)) {
+      handled = true;
+      break;
+    }
+  }
+  return handled;
+}
+
 void WebContentsImpl::Stop() {
   for (FrameTreeNode* node : frame_tree_.Nodes())
     node->StopLoading();