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

chrome/browser/custom_handlers/register_protocol_handler_infobar_delegate.cc

Index: chrome/browser/custom_handlers/register_protocol_handler_infobar_delegate.cc
===================================================================
--- chrome/browser/custom_handlers/register_protocol_handler_infobar_delegate.cc	(revision 175396)
+++ chrome/browser/custom_handlers/register_protocol_handler_infobar_delegate.cc	(working copy)
@@ -17,13 +17,30 @@
 using content::Referrer;
 using content::UserMetricsAction;
 
-RegisterProtocolHandlerInfoBarDelegate::RegisterProtocolHandlerInfoBarDelegate(
+// static
+void RegisterProtocolHandlerInfoBarDelegate::Create(
     InfoBarService* infobar_service,
     ProtocolHandlerRegistry* registry,
-    const ProtocolHandler& handler)
-    : ConfirmInfoBarDelegate(infobar_service),
-      registry_(registry),
-      handler_(handler) {
+    const ProtocolHandler& handler) {
+  content::RecordAction(
+      content::UserMetricsAction("RegisterProtocolHandler.InfoBar_Shown"));
+
+  scoped_ptr<InfoBarDelegate> infobar(
+      new RegisterProtocolHandlerInfoBarDelegate(infobar_service, registry,
+                                                 handler));
+
+  for (size_t i = 0; i < infobar_service->GetInfoBarCount(); ++i) {
+    RegisterProtocolHandlerInfoBarDelegate* existing_delegate =
+        infobar_service->GetInfoBarDelegateAt(i)->
+            AsRegisterProtocolHandlerInfoBarDelegate();
+    if ((existing_delegate != NULL) &&
+        existing_delegate->handler_.IsEquivalent(handler)) {
+      infobar_service->ReplaceInfoBar(existing_delegate, infobar.Pass());
+      return;
+    }
+  }
+
+  infobar_service->AddInfoBar(infobar.Pass());
 }
 
 InfoBarDelegate::InfoBarAutomationType
@@ -47,6 +64,15 @@
           GetProtocolName(handler_));
 }
 
+RegisterProtocolHandlerInfoBarDelegate::RegisterProtocolHandlerInfoBarDelegate(
+    InfoBarService* infobar_service,
+    ProtocolHandlerRegistry* registry,
+    const ProtocolHandler& handler)
+    : ConfirmInfoBarDelegate(infobar_service),
+      registry_(registry),
+      handler_(handler) {
+}
+
 string16 RegisterProtocolHandlerInfoBarDelegate::GetProtocolName(
     const ProtocolHandler& handler) const {
   if (handler.protocol() == "mailto")
@@ -101,11 +127,6 @@
   return false;
 }
 
-bool RegisterProtocolHandlerInfoBarDelegate::IsReplacedBy(
-    RegisterProtocolHandlerInfoBarDelegate* delegate) {
-  return handler_.IsEquivalent(delegate->handler_);
-}
-
 RegisterProtocolHandlerInfoBarDelegate*
     RegisterProtocolHandlerInfoBarDelegate::
         AsRegisterProtocolHandlerInfoBarDelegate() {