ServiceWorker: Add running service worker check before claim a provider host.

content/browser/service_worker/service_worker_registration.cc

Index: content/browser/service_worker/service_worker_registration.cc
diff --git a/content/browser/service_worker/service_worker_registration.cc b/content/browser/service_worker/service_worker_registration.cc
index 0ccc2e40341d11a9da3e70b6527615385cf314ca..ae48d1dc0f889baa6052bc62e1d2a5c58ee1ed00 100644
--- a/content/browser/service_worker/service_worker_registration.cc
+++ b/content/browser/service_worker/service_worker_registration.cc
@@ -396,6 +396,8 @@ void ServiceWorkerRegistration::DidGetRegistrationsForClaimClients(
 bool ServiceWorkerRegistration::ShouldClaim(
     ServiceWorkerProviderHost* provider_host,
     const std::vector<ServiceWorkerRegistrationInfo>& registrations) {
+  if (provider_host->IsHostToRunningServiceWorker())
+    return false;
   if (provider_host->controlling_version() == active_version())
     return false;