Content Settings: Add RevocationObserver to measure when permissions are revoked

chrome/browser/permissions/permission_manager.h

 // 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_PERMISSIONS_PERMISSION_MANAGER_H_
 #define CHROME_BROWSER_PERMISSIONS_PERMISSION_MANAGER_H_
 
 #include "base/callback_forward.h"
 #include "base/id_map.h"
 #include "base/macros.h"
@@ skipping 68 matching lines @@
   // Not all WebContents are able to display permission requests. If the PBM
   // is required but missing for |web_contents|, don't pass along the request.
   bool IsPermissionBubbleManagerMissing(content::WebContents* web_contents);
 
   // content_settings::Observer implementation.
   void OnContentSettingChanged(const ContentSettingsPattern& primary_pattern,
                                const ContentSettingsPattern& secondary_pattern,
                                ContentSettingsType content_type,
                                std::string resource_identifier) override;
 
+  // content_settings::RevocationObserver implementation.

[Bernhard Bauer, 2016/03/21 11:56:31]

Nit: s/Revocation//

+  void OnContentSettingRevoked(const GURL& primary_url,
+                               const GURL& secondary_url,
+                               ContentSettingsType content_type,
+                               std::string resource_identifier) override;
+
   Profile* profile_;
   PendingRequestsMap pending_requests_;
   SubscriptionsMap subscriptions_;
 
   base::WeakPtrFactory<PermissionManager> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PermissionManager);
 };
 
 #endif // CHROME_BROWSER_PERMISSIONS_PERMISSION_MANAGER_H_