Add a NavigationThrottle to the public content/ interface

chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc

Index: chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
diff --git a/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc b/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
index 5ddf0e8d3de684418977cc47122d768a4a5f362d..666d9167ec7da9d50a85f1c69f1a630c88ad5efa 100644
--- a/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
+++ b/chrome/browser/renderer_host/chrome_resource_dispatcher_host_delegate.cc
@@ -341,22 +341,8 @@ void ChromeResourceDispatcherHostDelegate::RequestBeginning(
 #if defined(OS_ANDROID)
   // TODO(davidben): This is insufficient to integrate with prerender properly.
   // https://crbug.com/370595
-  if (!is_prerendering) {
-    if (resource_type == content::RESOURCE_TYPE_MAIN_FRAME) {
-      throttles->push_back(
-          InterceptNavigationDelegate::CreateThrottleFor(request));
-    } else {
-      InterceptNavigationDelegate::UpdateUserGestureCarryoverInfo(request);
-    }
-  }
-#else
-  if (resource_type == content::RESOURCE_TYPE_MAIN_FRAME) {
-    // Redirect some navigations to apps that have registered matching URL
-    // handlers ('url_handlers' in the manifest).
-    content::ResourceThrottle* url_to_app_throttle =
-        AppUrlRedirector::MaybeCreateThrottleFor(request, io_data);
-    if (url_to_app_throttle)
-      throttles->push_back(url_to_app_throttle);
+  if (!is_prerendering && resource_type != content::RESOURCE_TYPE_MAIN_FRAME) {
+    InterceptNavigationDelegate::UpdateUserGestureCarryoverInfo(request);
   }
 #endif