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 796942443bcba1ac61bab2ebe7839e363140f694..5746e1abc547c3387fb4bac60e00a92b5769c3f6 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) {}