Remove default key slot from KeygenHandler.

content/public/browser/resource_context.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 CONTENT_PUBLIC_BROWSER_RESOURCE_CONTEXT_H_
 #define CONTENT_PUBLIC_BROWSER_RESOURCE_CONTEXT_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 36 matching lines @@
 
   // Get platform ClientCertStore. May return NULL.
   virtual scoped_ptr<net::ClientCertStore> CreateClientCertStore();
 
   // Create a platform KeygenHandler and pass it to |callback|. The |callback|
   // may be run synchronously.
   virtual void CreateKeygenHandler(
       uint32 key_size_in_bits,
       const std::string& challenge_string,
       const GURL& url,
-      const base::Callback<void(scoped_ptr<net::KeygenHandler>)>& callback);
+      const base::Callback<void(scoped_ptr<net::KeygenHandler>)>& callback) = 0;
 
   // Returns true if microphone access is allowed for |origin|. Used to
   // determine what level of authorization is given to |origin| to access
   // resource metadata.
   virtual bool AllowMicAccess(const GURL& origin) = 0;
 
   // Returns true if web camera access is allowed for |origin|. Used to
   // determine what level of authorization is given to |origin| to access
   // resource metadata.
   virtual bool AllowCameraAccess(const GURL& origin) = 0;
@@ skipping 19 matching lines @@
   //
   // TODO(perkj): Make this method pure virtual when crbug/315022 is
   // fixed.
   typedef base::Callback<std::string()> SaltCallback;
   virtual SaltCallback GetMediaDeviceIDSalt();
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_RESOURCE_CONTEXT_H_