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

chrome/browser/extensions/extension_infobar_delegate.cc

Index: chrome/browser/extensions/extension_infobar_delegate.cc
===================================================================
--- chrome/browser/extensions/extension_infobar_delegate.cc	(revision 175396)
+++ chrome/browser/extensions/extension_infobar_delegate.cc	(working copy)
@@ -16,6 +16,23 @@
 #include "content/public/browser/notification_details.h"
 #include "content/public/browser/notification_source.h"
 
+
+ExtensionInfoBarDelegate::~ExtensionInfoBarDelegate() {
+  if (observer_)
+    observer_->OnDelegateDeleted();
+}
+
+// static
+void ExtensionInfoBarDelegate::Create(InfoBarService* infobar_service,
+                                      Browser* browser,
+                                      const extensions::Extension* extension,
+                                      const GURL& url,
+                                      int height) {
+  infobar_service->AddInfoBar(scoped_ptr<InfoBarDelegate>(
+      new ExtensionInfoBarDelegate(browser, infobar_service, extension, url,
+                                   height)));
+}
+
 ExtensionInfoBarDelegate::ExtensionInfoBarDelegate(
     Browser* browser,
     InfoBarService* infobar_service,
@@ -54,11 +71,6 @@
     height_ = default_height;
 }
 
-ExtensionInfoBarDelegate::~ExtensionInfoBarDelegate() {
-  if (observer_)
-    observer_->OnDelegateDeleted();
-}
-
 bool ExtensionInfoBarDelegate::EqualsDelegate(InfoBarDelegate* delegate) const {
   ExtensionInfoBarDelegate* extension_delegate =
       delegate->AsExtensionInfoBarDelegate();