[Extensions] Fix two typos in ipc_message_sender.cc

Bug: None
Change-Id: Icdd29a8ee9fd005369bba60304ba4d9ea42643f8
Reviewed-on: https://chromium-review.googlesource.com/1176821Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
Commit-Queue: Istiaque Ahmed <lazyboy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583497}

extensions/renderer/ipc_message_sender.cc

@@ -265,7 +265,7 @@ class WorkerThreadIPCMessageSender : public IPCMessageSender {
     DCHECK_NE(kMainThreadId, content::WorkerThread::GetCurrentId());
     ServiceWorkerIdentifier sw_identifier;
     sw_identifier.scope = context->service_worker_scope();
-    sw_identifier.thread_id = content::WorkerThread::GetCurrentId(),
+    sw_identifier.thread_id = content::WorkerThread::GetCurrentId();
     dispatcher_->Send(new ExtensionHostMsg_AddFilteredListener(
         context->GetExtensionID(), event_name, sw_identifier, filter, is_lazy));
   }
@@ -278,7 +278,7 @@ class WorkerThreadIPCMessageSender : public IPCMessageSender {
     DCHECK_NE(kMainThreadId, content::WorkerThread::GetCurrentId());
     ServiceWorkerIdentifier sw_identifier;
     sw_identifier.scope = context->service_worker_scope();
-    sw_identifier.thread_id = content::WorkerThread::GetCurrentId(),
+    sw_identifier.thread_id = content::WorkerThread::GetCurrentId();
     dispatcher_->Send(new ExtensionHostMsg_RemoveFilteredListener(
         context->GetExtensionID(), event_name, sw_identifier, filter,
         remove_lazy_listener));