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

chrome/browser/intents/web_intents_registry.h

Index: chrome/browser/intents/web_intents_registry.h
diff --git a/chrome/browser/intents/web_intents_registry.h b/chrome/browser/intents/web_intents_registry.h
index 0b7a706f163922270dd26d3e6e8384e744530307..571cc2454dd92c89f916fe9d2166cc96f10c9c3b 100644
--- a/chrome/browser/intents/web_intents_registry.h
+++ b/chrome/browser/intents/web_intents_registry.h
@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_INTENTS_WEB_INTENTS_REGISTRY_H_
 #pragma once
 
+#include "base/callback.h"
 #include "base/hash_tables.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ -59,6 +60,13 @@ class WebIntentsRegistry
   // Requests all intent providers. |consumer| must not be NULL
   QueryID GetAllIntentProviders(Consumer* consumer);
 
+  // Tests for the existence of the given intent |provider|. Calls the
+  // provided |callback| with true if it exists, false if it does not.
+  // Checks for |provider| equality with ==.
+  QueryID IntentProviderExists(
+      const webkit_glue::WebIntentServiceData& provider,
+      const base::Callback<void(bool)>& callback);
+
  protected:
   // Make sure that only WebIntentsRegistryFactory can create an instance of
   // WebIntentsRegistry.