Remove last usage functions from HostContentSettingsMap and clean up prefs

content/public/browser/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 CONTENT_PUBLIC_BROWSER_PERMISSION_MANAGER_H_
 #define CONTENT_PUBLIC_BROWSER_PERMISSION_MANAGER_H_
 
 #include "content/common/content_export.h"
 #include "third_party/WebKit/public/platform/modules/permissions/permission_status.mojom.h"
 
@@ skipping 59 matching lines @@
       PermissionType permission,
       const GURL& requesting_origin,
       const GURL& embedding_origin) = 0;
 
   // Sets the permission back to its default for the requesting_origin/
   // embedding_origin tuple.
   virtual void ResetPermission(PermissionType permission,
                                const GURL& requesting_origin,
                                const GURL& embedding_origin) = 0;
 
-  // Registers a permission usage.
-  // TODO(mlamouri): see if we can remove this from the PermissionManager.
-  virtual void RegisterPermissionUsage(PermissionType permission,
-                                       const GURL& requesting_origin,
-                                       const GURL& embedding_origin) = 0;
-
   // Runs the given |callback| whenever the |permission| associated with the
   // pair { requesting_origin, embedding_origin } changes.
   // Returns the subscription_id to be used to unsubscribe. Can be
   // kNoPendingOperation if the subscribe was not successful.
   virtual int SubscribePermissionStatusChange(
       PermissionType permission,
       const GURL& requesting_origin,
       const GURL& embedding_origin,
       const base::Callback<void(blink::mojom::PermissionStatus)>& callback) = 0;
 
   // Unregisters from permission status change notifications.
   // The |subscription_id| must match the value returned by the
   // SubscribePermissionStatusChange call. Unsubscribing
   // an already unsubscribed |subscription_id| or providing the
   // |subscription_id| kNoPendingOperation is a no-op.
   virtual void UnsubscribePermissionStatusChange(int subscription_id) = 0;
 };
 
 }  // namespace content
 
 #endif // CONTENT_PUBLIC_BROWSER_PERMISSION_MANAGER_H_