Reland of 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 725ab34f9e747bee4cc9b1e522c39e7c0509003f..e710ed2ac9c43732230606dc440af138c8e4e3f7 100644
--- a/content/public/browser/content_browser_client.cc
+++ b/content/public/browser/content_browser_client.cc
@@ -363,6 +363,12 @@ void ContentBrowserClient::OpenURL(
   callback.Run(nullptr);
 }
 
+ScopedVector<NavigationThrottle>
+ContentBrowserClient::CreateThrottlesForNavigation(
+    NavigationHandle* navigation_handle) {
+  return ScopedVector<NavigationThrottle>();
+}
+
 #if defined(OS_WIN)
 const wchar_t* ContentBrowserClient::GetResourceDllName() {
   return nullptr;