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 01b58bd9d148828546b7e7c2fe3d810fa847e548..091d774a25def03e79de1131e9c2a0ae984efd06 100644
--- a/content/public/browser/content_browser_client.cc
+++ b/content/public/browser/content_browser_client.cc
@@ -359,6 +359,11 @@ void ContentBrowserClient::OpenURL(
   callback.Run(nullptr);
 }
 
+ScopedVector<NavigationThrottle> ContentBrowserClient::GetNavigationThrottles(
+    NavigationHandle* navigation_handle) {
+  return ScopedVector<NavigationThrottle>();
+}
+
 #if defined(OS_WIN)
 const wchar_t* ContentBrowserClient::GetResourceDllName() {
   return nullptr;