Change infobar creation to use a public static Create() method on the infobar delegate classes.

chrome/browser/ui/sync/one_click_signin_infobar_delegate.cc

Index: chrome/browser/ui/sync/one_click_signin_infobar_delegate.cc
===================================================================
--- chrome/browser/ui/sync/one_click_signin_infobar_delegate.cc	(revision 175396)
+++ chrome/browser/ui/sync/one_click_signin_infobar_delegate.cc	(working copy)
@@ -4,11 +4,6 @@
 
 #include "chrome/browser/ui/sync/one_click_signin_infobar_delegate.h"
 
-OneClickSigninInfoBarDelegate::OneClickSigninInfoBarDelegate(
-    InfoBarService* infobar_service)
-    : ConfirmInfoBarDelegate(infobar_service) {
-}
-
 OneClickSigninInfoBarDelegate::~OneClickSigninInfoBarDelegate() {
 }
 
@@ -16,3 +11,8 @@
     AlternateColors* alt_colors) {
   alt_colors->enabled = false;
 }
+
+OneClickSigninInfoBarDelegate::OneClickSigninInfoBarDelegate(
+    InfoBarService* infobar_service)
+    : ConfirmInfoBarDelegate(infobar_service) {
+}