[New Tab Page] Change the mechanism to intercept online NTP errors

chrome/browser/chrome_content_browser_client.cc

Index: chrome/browser/chrome_content_browser_client.cc
diff --git a/chrome/browser/chrome_content_browser_client.cc b/chrome/browser/chrome_content_browser_client.cc
index 2350b171bc7dce05f9fa8beb3d0a2849f3887ffa..097fdd30d44bbda06ac6ae0cfe67316877233fb0 100644
--- a/chrome/browser/chrome_content_browser_client.cc
+++ b/chrome/browser/chrome_content_browser_client.cc
@@ -76,6 +76,8 @@
 #include "chrome/browser/ui/blocked_content/blocked_window_params.h"
 #include "chrome/browser/ui/blocked_content/popup_blocker_tab_helper.h"
 #include "chrome/browser/ui/chrome_select_file_policy.h"
+#include "chrome/browser/ui/search/new_tab_page_interceptor_service.h"
+#include "chrome/browser/ui/search/new_tab_page_interceptor_service_factory.h"
 #include "chrome/browser/ui/sync/sync_promo_ui.h"
 #include "chrome/browser/ui/tab_contents/chrome_web_contents_view_delegate.h"
 #include "chrome/browser/ui/webui/chrome_web_ui_controller_factory.h"
@@ -974,6 +976,10 @@ ChromeContentBrowserClient::CreateRequestContext(
     content::ProtocolHandlerMap* protocol_handlers,
     content::URLRequestInterceptorScopedVector request_interceptors) {
   Profile* profile = Profile::FromBrowserContext(browser_context);
+  NewTabPageInterceptorService* service =
+      NewTabPageInterceptorServiceFactory::GetForProfile(profile);
+  if (service)
+    request_interceptors.push_back(service->CreateInterceptor().release());
   return profile->CreateRequestContext(protocol_handlers,
                                        request_interceptors.Pass());
 }