Remove support for the keygen tag

content/child/blink_platform_impl.h

 // Copyright 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 CONTENT_CHILD_BLINK_PLATFORM_IMPL_H_
 #define CONTENT_CHILD_BLINK_PLATFORM_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 55 matching lines @@
       int desired_flags) override;
   int databaseDeleteFile(const blink::WebString& vfs_file_name,
                          bool sync_dir) override;
   long databaseGetFileAttributes(
       const blink::WebString& vfs_file_name) override;
   long long databaseGetFileSize(const blink::WebString& vfs_file_name) override;
   long long databaseGetSpaceAvailableForOrigin(
       const blink::WebSecurityOrigin& origin) override;
   bool databaseSetFileSize(const blink::WebString& vfs_file_name,
                            long long size) override;
-  blink::WebString signedPublicKeyAndChallengeString(
-      unsigned key_size_index,
-      const blink::WebString& challenge,
-      const blink::WebURL& url,
-      const blink::WebURL& top_origin) override;
   size_t actualMemoryUsageMB() override;
   size_t numberOfProcessors() override;
 
   size_t maxDecodedImageBytes() override;
   uint32_t getUniqueIdForProcess() override;
   blink::WebString userAgent() override;
   blink::WebURLError cancelledError(const blink::WebURL& url) const override;
   blink::WebThread* createThread(const char* name) override;
   blink::WebThread* currentThread() override;
   void recordAction(const blink::UserMetricsAction&) override;
@@ skipping 50 matching lines @@
   scoped_refptr<ThreadSafeSender> thread_safe_sender_;
   scoped_refptr<NotificationDispatcher> notification_dispatcher_;
   scoped_refptr<PushDispatcher> push_dispatcher_;
 
   blink::scheduler::WebThreadBase* compositor_thread_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_BLINK_PLATFORM_IMPL_H_