Remove support for the keygen tag

content/child/blink_platform_impl.cc

Index: content/child/blink_platform_impl.cc
diff --git a/content/child/blink_platform_impl.cc b/content/child/blink_platform_impl.cc
index 1f401ec96bd692ca5f1e8b7104fa8c8de3624ecf..151a67667d54064984c213afae740743fdfd12b1 100644
--- a/content/child/blink_platform_impl.cc
+++ b/content/child/blink_platform_impl.cc
@@ -230,10 +230,6 @@ static int ToMessageID(WebLocalizedString::Name name) {
       return IDS_FORM_FILE_NO_FILE_LABEL;
     case WebLocalizedString::InputElementAltText:
       return IDS_FORM_INPUT_ALT;
-    case WebLocalizedString::KeygenMenuHighGradeKeySize:
-      return IDS_KEYGEN_HIGH_GRADE_KEY;
-    case WebLocalizedString::KeygenMenuMediumGradeKeySize:
-      return IDS_KEYGEN_MED_GRADE_KEY;
     case WebLocalizedString::MissingPluginText:
       return IDS_PLUGIN_INITIALIZATION_ERROR;
     case WebLocalizedString::MultipleFileUploadText:
@@ -810,14 +806,6 @@ bool BlinkPlatformImpl::databaseSetFileSize(
   return false;
 }
 
-blink::WebString BlinkPlatformImpl::signedPublicKeyAndChallengeString(
-    unsigned key_size_index,
-    const blink::WebString& challenge,
-    const blink::WebURL& url,
-    const blink::WebURL& top_origin) {
-  return blink::WebString("");
-}
-
 size_t BlinkPlatformImpl::actualMemoryUsageMB() {
   return GetMemoryUsageKB() >> 10;
 }