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

chrome/browser/ui/search/new_tab_page_interceptor_service_factory.cc

Index: chrome/browser/ui/search/new_tab_page_interceptor_service_factory.cc
diff --git a/chrome/browser/ui/search/new_tab_page_interceptor_service_factory.cc b/chrome/browser/ui/search/new_tab_page_interceptor_service_factory.cc
new file mode 100644
index 0000000000000000000000000000000000000000..592bb27e02513c4cfc86da3b1cf3b5841e756983
--- /dev/null
+++ b/chrome/browser/ui/search/new_tab_page_interceptor_service_factory.cc
@@ -0,0 +1,47 @@
+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/ui/search/new_tab_page_interceptor_service_factory.h"
+
+#include "chrome/browser/profiles/profile.h"
+#include "chrome/browser/search/instant_service_factory.h"
+#include "chrome/browser/ui/search/new_tab_page_interceptor_service.h"
+#include "components/keyed_service/content/browser_context_dependency_manager.h"
+#include "content/public/browser/browser_thread.h"
+
+// static
+NewTabPageInterceptorServiceFactory*
+NewTabPageInterceptorServiceFactory::GetInstance() {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  return Singleton<NewTabPageInterceptorServiceFactory>::get();
+}
+
+// static
+NewTabPageInterceptorService*
+NewTabPageInterceptorServiceFactory::GetForProfile(Profile* profile) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  if (profile->IsOffTheRecord())
+    return nullptr;
+
+  return static_cast<NewTabPageInterceptorService*>(
+      GetInstance()->GetServiceForBrowserContext(profile, true));
+}
+
+NewTabPageInterceptorServiceFactory::NewTabPageInterceptorServiceFactory()
+    : BrowserContextKeyedServiceFactory(
+          "NTP Request Interceptor Service Factory",
+          BrowserContextDependencyManager::GetInstance()) {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  DependsOn(InstantServiceFactory::GetInstance());
+}
+
+NewTabPageInterceptorServiceFactory::~NewTabPageInterceptorServiceFactory() {
+}
+
+KeyedService* NewTabPageInterceptorServiceFactory::BuildServiceInstanceFor(
+    content::BrowserContext* context) const {
+  DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
+  Profile* profile = Profile::FromBrowserContext(context);
+  return new NewTabPageInterceptorService(profile);
+}