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

chrome/browser/ui/search/new_tab_page_interceptor_service_factory.h

Index: chrome/browser/ui/search/new_tab_page_interceptor_service_factory.h
diff --git a/chrome/browser/ui/search/new_tab_page_interceptor_service_factory.h b/chrome/browser/ui/search/new_tab_page_interceptor_service_factory.h
new file mode 100644
index 0000000000000000000000000000000000000000..fe7a78f7a35b2e6caba9651d5a9bae1beece3f9a
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+++ b/chrome/browser/ui/search/new_tab_page_interceptor_service_factory.h
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+// 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.
+
+#ifndef CHROME_BROWSER_UI_SEARCH_NEW_TAB_PAGE_INTERCEPTOR_SERVICE_FACTORY_H_
+#define CHROME_BROWSER_UI_SEARCH_NEW_TAB_PAGE_INTERCEPTOR_SERVICE_FACTORY_H_
+
+#include "base/memory/singleton.h"
+#include "components/keyed_service/content/browser_context_keyed_service_factory.h"
+#include "components/keyed_service/core/keyed_service.h"
+
+class NewTabPageInterceptorService;
+class Profile;
+
+namespace content {
+class BrowserContext;
+}
+
+namespace net {
+class URLRequestInterceptor;
+}
+
+// Owns and creates NewTabPageInterceptorService instances.
+class NewTabPageInterceptorServiceFactory
+    : public BrowserContextKeyedServiceFactory {
+ public:
+  static NewTabPageInterceptorService* GetForProfile(Profile* profile);
+  static NewTabPageInterceptorServiceFactory* GetInstance();
+
+ private:
+  friend struct DefaultSingletonTraits<NewTabPageInterceptorServiceFactory>;
+
+  NewTabPageInterceptorServiceFactory();
+  ~NewTabPageInterceptorServiceFactory() override;
+
+  // BrowserContextKeyedServiceFactory:
+  KeyedService* BuildServiceInstanceFor(
+      content::BrowserContext* context) const override;
+
+  DISALLOW_COPY_AND_ASSIGN(NewTabPageInterceptorServiceFactory);
+};
+
+#endif  // CHROME_BROWSER_UI_SEARCH_NEW_TAB_PAGE_INTERCEPTOR_SERVICE_FACTORY_H_