Remove outdated comment from content_settings_client.h

components/content_settings/core/browser/content_settings_client.h

 // Copyright (c) 2014 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 COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_CLIENT_H_
 #define COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_CLIENT_H_
 
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/strings/string16.h"
 #include "net/cookies/canonical_cookie.h"
 
 class GURL;
 class LocalSharedObjectsCounter;
 
 namespace net {
 class CookieOptions;
 }
 
 namespace content_settings {
 
 // An abstraction of operations that depend on the embedder (e.g. Chrome).
-// For mock / testing implementation in tests you can inherit from
-// StubContentSettingsClient instead to avoid the need to stub unneeded pure
-// virtual methods.
 class ContentSettingsClient {
  public:
   enum AccessType { BLOCKED, ALLOWED };
 
   ContentSettingsClient() {}
   virtual ~ContentSettingsClient() {}
 
   // Methods to notify the client about access to local shared objects.
   virtual void OnCookiesRead(const GURL& url,
                              const GURL& first_party_url,
@@ skipping 27 matching lines @@
   virtual const LocalSharedObjectsCounter& local_shared_objects(
       AccessType type) const = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ContentSettingsClient);
 };
 
 }  // namespace content_settings
 
 #endif  // COMPONENTS_CONTENT_SETTINGS_CORE_BROWSER_CONTENT_SETTINGS_CLIENT_H_