DevTools protocol interception, blocking & modification of requests

content/browser/frame_host/navigation_request.cc

Index: content/browser/frame_host/navigation_request.cc
diff --git a/content/browser/frame_host/navigation_request.cc b/content/browser/frame_host/navigation_request.cc
index a5a193160646054bdf9751aaf94b7c100b7092ed..42e0aa6e653410f86c58b14cb06b9913a4369edb 100644
--- a/content/browser/frame_host/navigation_request.cc
+++ b/content/browser/frame_host/navigation_request.cc
@@ -150,14 +150,9 @@ void AddAdditionalRequestHeaders(net::HttpRequestHeaders* headers,
                                   ? GetContentClient()->GetUserAgent()
                                   : user_agent_override);
 
-  // Check whether DevTools wants to override user agent for this request
-  // after setting the default user agent.
-  std::string devtools_user_agent =
-      RenderFrameDevToolsAgentHost::UserAgentOverride(frame_tree_node);
-  if (!devtools_user_agent.empty()) {
-    headers->SetHeader(net::HttpRequestHeaders::kUserAgent,
-                       devtools_user_agent);
-  }
+  // Let DevTools modify the headers (e.g. UserAgent) if required.
+  RenderFrameDevToolsAgentHost::ModifyRequestHeadersIfNeeded(frame_tree_node,
+                                                             headers);
 
   // Tack an 'Upgrade-Insecure-Requests' header to outgoing navigational
   // requests, as described in