Revert 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 f25c84abacade494f687e7d6dfcb1dc14ce2cceb..01b58bd9d148828546b7e7c2fe3d810fa847e548 100644
--- a/content/public/browser/content_browser_client.cc
+++ b/content/public/browser/content_browser_client.cc
@@ -359,12 +359,6 @@
   callback.Run(nullptr);
 }
 
-ScopedVector<NavigationThrottle>
-ContentBrowserClient::CreateThrottlesForNavigation(
-    NavigationHandle* navigation_handle) {
-  return ScopedVector<NavigationThrottle>();
-}
-
 #if defined(OS_WIN)
 const wchar_t* ContentBrowserClient::GetResourceDllName() {
   return nullptr;