PaymentHandler: Implement GetAllPaymentApps().

content/browser/service_worker/service_worker_context_wrapper.h

Index: content/browser/service_worker/service_worker_context_wrapper.h
diff --git a/content/browser/service_worker/service_worker_context_wrapper.h b/content/browser/service_worker/service_worker_context_wrapper.h
index de171d37ec653059e0796dccaf3232f2b0a7d5de..599c157346d86f351ffcf5ea9d332a6c30cbe422 100644
--- a/content/browser/service_worker/service_worker_context_wrapper.h
+++ b/content/browser/service_worker/service_worker_context_wrapper.h
@@ -203,6 +203,9 @@ class CONTENT_EXPORT ServiceWorkerContextWrapper
   void GetUserDataForAllRegistrations(
       const std::string& key,
       const GetUserDataForAllRegistrationsCallback& callback);
+  void GetUserDataForAllRegistrationsByKeyPrefix(
+      const std::string& key_prefix,
+      const GetUserDataForAllRegistrationsCallback& callback);
 
   // This function can be called from any thread, but the callback will always
   // be called on the UI thread.