Minor infobar cleanup.

components/infobars/core/infobar_delegate.cc

Index: components/infobars/core/infobar_delegate.cc
diff --git a/components/infobars/core/infobar_delegate.cc b/components/infobars/core/infobar_delegate.cc
index 65646f93618dc62b74ac26b77ff1b272d33eaf03..1a47609670adac139593910e9b0218d91d6ef5d0 100644
--- a/components/infobars/core/infobar_delegate.cc
+++ b/components/infobars/core/infobar_delegate.cc
@@ -36,10 +36,6 @@ bool InfoBarDelegate::ShouldExpire(const NavigationDetails& details) const {
 void InfoBarDelegate::InfoBarDismissed() {
 }
 
-int InfoBarDelegate::GetIconID() const {
-  return kNoIconID;
-}
-
 InfoBarDelegate::Type InfoBarDelegate::GetInfoBarType() const {
   return WARNING_TYPE;
 }
@@ -88,6 +84,10 @@ ThemeInstalledInfoBarDelegate*
   return nullptr;
 }
 
+ThreeDAPIInfoBarDelegate* InfoBarDelegate::AsThreeDAPIInfoBarDelegate() {
+  return nullptr;
+}
+
 translate::TranslateInfoBarDelegate*
 InfoBarDelegate::AsTranslateInfoBarDelegate() {
   return nullptr;
@@ -113,4 +113,8 @@ bool InfoBarDelegate::ShouldExpireInternal(
   return (contents_unique_id_ != details.entry_id) || details.is_reload;
 }
 
+int InfoBarDelegate::GetIconID() const {
+  return kNoIconID;
+}
+
 }  // namespace infobars