Delete unused chrome://fallback-icon/ handling

chrome/browser/favicon/fallback_icon_service_factory.cc

-// 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/favicon/fallback_icon_service_factory.h"
-
-#include "base/memory/singleton.h"
-#include "chrome/browser/favicon/chrome_fallback_icon_client_factory.h"
-#include "chrome/browser/profiles/incognito_helpers.h"
-#include "components/favicon/core/fallback_icon_service.h"
-#include "components/keyed_service/content/browser_context_dependency_manager.h"
-#include "content/public/browser/browser_context.h"
-
-// static
-favicon::FallbackIconService* FallbackIconServiceFactory::GetForBrowserContext(
-    content::BrowserContext* context) {
-  return static_cast<favicon::FallbackIconService*>(
-      GetInstance()->GetServiceForBrowserContext(context, true));
-}
-
-// static
-FallbackIconServiceFactory* FallbackIconServiceFactory::GetInstance() {
-  return base::Singleton<FallbackIconServiceFactory>::get();
-}
-
-FallbackIconServiceFactory::FallbackIconServiceFactory()
-    : BrowserContextKeyedServiceFactory(
-        "FallbackIconService",
-        BrowserContextDependencyManager::GetInstance()) {
-  DependsOn(ChromeFallbackIconClientFactory::GetInstance());
-}
-
-FallbackIconServiceFactory::~FallbackIconServiceFactory() {}
-
-content::BrowserContext* FallbackIconServiceFactory::GetBrowserContextToUse(
-      content::BrowserContext* context) const {
-  return chrome::GetBrowserContextRedirectedInIncognito(context);
-}
-
-KeyedService* FallbackIconServiceFactory::BuildServiceInstanceFor(
-    content::BrowserContext* context) const {
-  favicon::FallbackIconClient* fallback_icon_client =
-      ChromeFallbackIconClientFactory::GetForBrowserContext(context);
-  return new favicon::FallbackIconService(fallback_icon_client);
-}
-
-bool FallbackIconServiceFactory::ServiceIsNULLWhileTesting() const {
-  return true;
-}