Remove support for the keygen tag

third_party/WebKit/Source/core/loader/FrameLoaderClient.h

Index: third_party/WebKit/Source/core/loader/FrameLoaderClient.h
diff --git a/third_party/WebKit/Source/core/loader/FrameLoaderClient.h b/third_party/WebKit/Source/core/loader/FrameLoaderClient.h
index c445ac17bcae4e850541be098b8b0d271a1968e3..5332b9d3837f05691d6c5db1e0375c84b9e4b0d9 100644
--- a/third_party/WebKit/Source/core/loader/FrameLoaderClient.h
+++ b/third_party/WebKit/Source/core/loader/FrameLoaderClient.h
@@ -263,9 +263,6 @@ class CORE_EXPORT FrameLoaderClient : public FrameClient {
   // This callback is similar, but for plugins.
   virtual void didNotAllowPlugins() {}
 
-  // This callback notifies the client that the frame created a Keygen element.
-  virtual void didUseKeygen() {}
-
   virtual WebCookieJar* cookieJar() const = 0;
 
   virtual void didChangeName(const String& name, const String& uniqueName) {}