Add a NavigationThrottle to the public content/ interface

content/public/browser/content_browser_client.cc

Index: content/public/browser/content_browser_client.cc
diff --git a/content/public/browser/content_browser_client.cc b/content/public/browser/content_browser_client.cc
index 5c4acbaaacb2559b95a36df286ece756af45a7e0..548a07b65a49e4c400896ffa3c92488b3279e343 100644
--- a/content/public/browser/content_browser_client.cc
+++ b/content/public/browser/content_browser_client.cc
@@ -354,6 +354,12 @@ void ContentBrowserClient::OpenURL(
   callback.Run(nullptr);
 }
 
+std::vector<NavigationThrottle*> ContentBrowserClient::AddNavigationThrottles(
+    NavigationHandle* navigation_handle,
+    WebContents* web_contents) {
+  return std::vector<NavigationThrottle*>();
+}
+
 #if defined(OS_WIN)
 const wchar_t* ContentBrowserClient::GetResourceDllName() {
   return nullptr;