Remove support for the keygen tag

content/renderer/renderer_blink_platform_impl.cc

Index: content/renderer/renderer_blink_platform_impl.cc
diff --git a/content/renderer/renderer_blink_platform_impl.cc b/content/renderer/renderer_blink_platform_impl.cc
index 2155b6fe23efe6bff2e992fb1c45616e5c3f3a90..bcee0b0e0943bf72ef7d44252ac1e8e6db22bf3b 100644
--- a/content/renderer/renderer_blink_platform_impl.cc
+++ b/content/renderer/renderer_blink_platform_impl.cc
@@ -783,20 +783,6 @@ blink::WebPublicSuffixList* RendererBlinkPlatformImpl::publicSuffixList() {
 
 //------------------------------------------------------------------------------
 
-blink::WebString RendererBlinkPlatformImpl::signedPublicKeyAndChallengeString(
-    unsigned key_size_index,
-    const blink::WebString& challenge,
-    const blink::WebURL& url,
-    const blink::WebURL& top_origin) {
-  std::string signed_public_key;
-  RenderThread::Get()->Send(new RenderProcessHostMsg_Keygen(
-      static_cast<uint32_t>(key_size_index), challenge.utf8(), GURL(url),
-      GURL(top_origin), &signed_public_key));
-  return WebString::fromUTF8(signed_public_key);
-}
-
-//------------------------------------------------------------------------------
-
 blink::WebScrollbarBehavior* RendererBlinkPlatformImpl::scrollbarBehavior() {
   return web_scrollbar_behavior_.get();
 }