Integrate the notification database with the normal code path.

content/public/browser/platform_notification_service.h

Index: content/public/browser/platform_notification_service.h
diff --git a/content/public/browser/platform_notification_service.h b/content/public/browser/platform_notification_service.h
index 52a2b72e789d4cae5e1a0677affbd5c676c8b8cf..7c4c1e4145f803377d3827a5726dcf33d7fbf28b 100644
--- a/content/public/browser/platform_notification_service.h
+++ b/content/public/browser/platform_notification_service.h
@@ -5,6 +5,7 @@
 #ifndef CONTENT_PUBLIC_BROWSER_PLATFORM_NOTIFICATION_SERVICE_H_
 #define CONTENT_PUBLIC_BROWSER_PLATFORM_NOTIFICATION_SERVICE_H_
 
+#include <stdint.h>
 #include <string>
 
 #include "base/callback_forward.h"
@@ -70,7 +71,7 @@ class CONTENT_EXPORT PlatformNotificationService {
   // |persistent_notification_id|. This method must be called on the UI thread.
   virtual void ClosePersistentNotification(
       BrowserContext* browser_context,
-      const std::string& persistent_notification_id) = 0;
+      int64_t persistent_notification_id) = 0;
 };
 
 }  // namespace content