Introduce ServiceWorkerHandle for tracking WebServiceWorkerImpl reference

content/child/service_worker/web_service_worker_impl.cc

Index: content/child/service_worker/web_service_worker_impl.cc
diff --git a/content/child/service_worker/web_service_worker_impl.cc b/content/child/service_worker/web_service_worker_impl.cc
index b49fe39cb260180d2a74c0d51fa48e9c06e3b127..c36d8606acc2d87e88b55311d882dc927eb2d24b 100644
--- a/content/child/service_worker/web_service_worker_impl.cc
+++ b/content/child/service_worker/web_service_worker_impl.cc
@@ -16,7 +16,18 @@ using blink::WebString;
 
 namespace content {
 
-WebServiceWorkerImpl::~WebServiceWorkerImpl() {}
+WebServiceWorkerImpl::WebServiceWorkerImpl(
+    int handle_id,
+    int64 version_id,
+    ThreadSafeSender* thread_safe_sender)
+    : handle_id_(handle_id),
+      version_id_(version_id),
+      thread_safe_sender_(thread_safe_sender) {}
+
+WebServiceWorkerImpl::~WebServiceWorkerImpl() {
+  thread_safe_sender_->Send(
+      new ServiceWorkerHostMsg_ServiceWorkerObjectDestroyed(handle_id_));
+}
 
 void WebServiceWorkerImpl::postMessage(const WebString& message,
                                        WebMessagePortChannelArray* channels) {