Add a check to the registry before the intent infobar is shown.

chrome/browser/intents/register_intent_handler_infobar_delegate.cc

Index: chrome/browser/intents/register_intent_handler_infobar_delegate.cc
diff --git a/chrome/browser/intents/register_intent_handler_infobar_delegate.cc b/chrome/browser/intents/register_intent_handler_infobar_delegate.cc
index 4c711e4c95e4a25b67708cf772a0bb007062dca7..8234d14c798534a6ca475017afd19f722e2c63cb 100644
--- a/chrome/browser/intents/register_intent_handler_infobar_delegate.cc
+++ b/chrome/browser/intents/register_intent_handler_infobar_delegate.cc
@@ -4,8 +4,11 @@
 
 #include "chrome/browser/intents/register_intent_handler_infobar_delegate.h"
 
+#include "base/bind.h"
+#include "base/bind_helpers.h"
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
+#include "chrome/browser/infobars/infobar_tab_helper.h"
 #include "chrome/browser/intents/web_intents_registry.h"
 #include "chrome/browser/intents/web_intents_registry_factory.h"
 #include "chrome/browser/profiles/profile.h"
@@ -60,3 +63,26 @@ bool RegisterIntentHandlerInfoBarDelegate::LinkClicked(
   // TODO(jhawkins): Add associated bug for the article here.
   return false;
 }
+
+// Helper continuation for MaybeShowIntentInfoBar.
+void CheckProvider(
+    InfoBarTabHelper* infobar_helper,
+    WebIntentsRegistry* registry,
+    const WebIntentServiceData& service,
+    bool provider_exists) {
+  if (!provider_exists)

[James Hawkins, 2011/10/05 22:27:17]

Braces required due to multi-line.

[Greg Billock, 2011/10/05 22:45:53]

Done.

+    infobar_helper->AddInfoBar(new RegisterIntentHandlerInfoBarDelegate(
+        infobar_helper, registry, service));
+}
+
+// static
+void RegisterIntentHandlerInfoBarDelegate::MaybeShowIntentInfoBar(
+    InfoBarTabHelper* infobar_helper,
+    WebIntentsRegistry* registry,
+    const WebIntentServiceData& service) {

[James Hawkins, 2011/10/05 22:27:17]

DCHECK(infobar_helper);

[Greg Billock, 2011/10/05 22:45:53]

Done.

+  registry->IntentProviderExists(service,
+                                 base::Bind(&CheckProvider,
+                                            base::Unretained(infobar_helper),
+                                            base::Unretained(registry),
+                                            service));
+}