ServiceWorker: Remove navigator.serviceWorker.{installing,waiting,active} (Chromium)

These attributes are gone:
https://slightlyoff.github.io/ServiceWorker/spec/service_worker/index.html#service-worker-container

Blink: https://codereview.chromium.org/541943003/

BUG=404982
TEST=content_unittests --gtest_filter=ServiceWorker*
TEST=run_webkit_tests.py --debug http/tests/serviceworker/

Review URL: https://codereview.chromium.org/544023002

Cr-Commit-Position: refs/heads/master@{#293501}

content/child/service_worker/web_service_worker_provider_impl.cc

@@ -47,21 +47,6 @@ void WebServiceWorkerProviderImpl::setClient(
   // for more context)
   GetDispatcher()->AddScriptClient(provider_id_, client);
 
-  if (context_->installing_handle_id() != kInvalidServiceWorkerHandleId) {
-    client->setInstalling(GetDispatcher()->GetServiceWorker(
-        context_->installing()->info(), false));
-  }
-
-  if (context_->waiting_handle_id() != kInvalidServiceWorkerHandleId) {
-    client->setWaiting(GetDispatcher()->GetServiceWorker(
-        context_->waiting()->info(), false));
-  }
-
-  if (context_->active_handle_id() != kInvalidServiceWorkerHandleId) {
-    client->setActive(GetDispatcher()->GetServiceWorker(
-        context_->active()->info(), false));
-  }
-
   if (context_->controller_handle_id() != kInvalidServiceWorkerHandleId) {
     client->setController(GetDispatcher()->GetServiceWorker(
         context_->controller()->info(), false));