Eliminate the LinkInfoBar[Delegate] classes entirely.

chrome/browser/api/infobars/infobar_delegate.cc

Index: chrome/browser/api/infobars/infobar_delegate.cc
diff --git a/chrome/browser/api/infobars/infobar_delegate.cc b/chrome/browser/api/infobars/infobar_delegate.cc
index d09aa94371640edd84cd92b7f77d7f54b913add0..7e5164fbb0ef0d751c49eb0b9023fee49e297f76 100644
--- a/chrome/browser/api/infobars/infobar_delegate.cc
+++ b/chrome/browser/api/infobars/infobar_delegate.cc
@@ -51,6 +51,10 @@ InfoBarDelegate::Type InfoBarDelegate::GetInfoBarType() const {
   return WARNING_TYPE;
 }
 
+AlternateNavInfoBarDelegate* InfoBarDelegate::AsAlternateNavInfoBarDelegate() {
+  return NULL;
+}
+
 AutoLoginInfoBarDelegate* InfoBarDelegate::AsAutoLoginInfoBarDelegate() {
   return NULL;
 }
@@ -68,10 +72,6 @@ InsecureContentInfoBarDelegate*
   return NULL;
 }
 
-LinkInfoBarDelegate* InfoBarDelegate::AsLinkInfoBarDelegate() {
-  return NULL;
-}
-
 MediaStreamInfoBarDelegate* InfoBarDelegate::AsMediaStreamInfoBarDelegate() {
   return NULL;
 }