ServiceWorker: Add a function to abort all pending jobs in SWJobCoordinator

content/browser/service_worker/service_worker_register_job_base.h

Index: content/browser/service_worker/service_worker_register_job_base.h
diff --git a/content/browser/service_worker/service_worker_register_job_base.h b/content/browser/service_worker/service_worker_register_job_base.h
index f292ee36a1eeb4e0a74ab6e95582ffa675c07d79..ec250820ef68aff5c958141bf53e33a072ec0bd2 100644
--- a/content/browser/service_worker/service_worker_register_job_base.h
+++ b/content/browser/service_worker/service_worker_register_job_base.h
@@ -18,6 +18,9 @@ class ServiceWorkerRegisterJobBase {
   // Starts the job. This method should be called once and only once per job.
   virtual void Start() = 0;
 
+  // Aborts the job. This method should be called once and only once per job.
+  virtual void Abort() = 0;
+
   // Returns true if this job is identical to |job| for the purpose of
   // collapsing them together in a ServiceWorkerJobCoordinator queue.
   // Registration jobs are equal if they are for the same pattern and script