Split WarningService from ExtensionSystem.

chrome/browser/extensions/extension_warning_badge_service.h

 // Copyright (c) 2012 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_EXTENSIONS_EXTENSION_WARNING_BADGE_SERVICE_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_WARNING_BADGE_SERVICE_H_
 
 #include "base/compiler_specific.h"
 #include "base/threading/non_thread_safe.h"
+#include "components/keyed_service/core/keyed_service.h"
 #include "extensions/browser/warning_service.h"
 #include "extensions/browser/warning_set.h"
 
 // TODO(battre): Rename ExtensionWarningBadgeService to WarningBadgeService.
 
 class Profile;
 
 namespace extensions {
 
 // A service that is responsible for showing an extension warning badge on the
 // wrench menu.
-class ExtensionWarningBadgeService : public WarningService::Observer,
+class ExtensionWarningBadgeService : public KeyedService,
+                                     public WarningService::Observer,
                                      public base::NonThreadSafe {
  public:
   explicit ExtensionWarningBadgeService(Profile* profile);
   virtual ~ExtensionWarningBadgeService();
 
+  static ExtensionWarningBadgeService* Get(content::BrowserContext* context);
+
   // Black lists all currently active extension warnings, so that they do not
   // trigger a warning badge again for the life-time of the browsing session.
   void SuppressCurrentWarnings();
 
  protected:
   // Virtual for testing.
   virtual const std::set<Warning>& GetCurrentWarnings() const;
 
  private:
   // Implementation of WarningService::Observer.
   void ExtensionWarningsChanged() override;
 
   void UpdateBadgeStatus();
   virtual void ShowBadge(bool show);
 
   Profile* profile_;
 
+  ScopedObserver<WarningService, WarningService::Observer>
+      warning_service_observer_;
+
   // Warnings that do not trigger a badge on the wrench menu.
   WarningSet suppressed_warnings_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionWarningBadgeService);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_WARNING_BADGE_SERVICE_H_