Extract permission alias info from PermissionsProvider

extensions/common/permissions/permissions_provider.h

 // Copyright 2013 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 EXTENSIONS_COMMON_PERMISSIONS_PERMISSIONS_PROVIDER_H_
 #define EXTENSIONS_COMMON_PERMISSIONS_PERMISSIONS_PROVIDER_H_
 
 #include <memory>
 #include <vector>
 
@@ skipping 13 matching lines @@
     const char* name;
     const char* alias;
 
     AliasInfo(const char* name, const char* alias)
         : name(name), alias(alias) {
     }
   };
   // Returns all the known permissions.
   virtual std::vector<std::unique_ptr<APIPermissionInfo>> GetAllPermissions()
       const = 0;
-
-  // Returns all the known permission aliases.
-  virtual std::vector<AliasInfo> GetAllAliases() const = 0;
 };
 
 }  // namespace extensions
 
 #endif  // EXTENSIONS_COMMON_PERMISSIONS_PERMISSIONS_PROVIDER_H_