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 7a712a314b384af4c078f26a4af8b6d3f9b293d8..5adadb5a0c1dc44d12f0c33e814ea11f090721f3 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"
@@ -42,10 +43,10 @@ class WebIntentsRegistry
                   ExtensionServiceInterface* extension_service);
 
   // Registers a web intent provider.
-  virtual void RegisterIntentProvider(const WebIntentServiceData& intent);
+  virtual void RegisterIntentProvider(const WebIntentServiceData& provider);
 
   // Removes a web intent provider from the registry.
-  void UnregisterIntentProvider(const WebIntentServiceData& intent);
+  void UnregisterIntentProvider(const WebIntentServiceData& provider);
 
   // Requests all intent providers matching |action|.
   // |consumer| must not be NULL.
@@ -54,6 +55,12 @@ 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 WebIntentServiceData& provider,
+                               const base::Callback<void(bool)>& callback);
+
  protected:
   // Make sure that only WebIntentsRegistryFactory can create an instance of
   // WebIntentsRegistry.