Limit requests for which link headers can install service workers to secure contexts.

content/browser/service_worker/service_worker_request_handler.cc

Index: content/browser/service_worker/service_worker_request_handler.cc
diff --git a/content/browser/service_worker/service_worker_request_handler.cc b/content/browser/service_worker/service_worker_request_handler.cc
index 7157aa540a8a26358c59dd8db4b491a9482a9244..f2c17c72adbb1cc84b6870d740b003b3fc84fd74 100644
--- a/content/browser/service_worker/service_worker_request_handler.cc
+++ b/content/browser/service_worker/service_worker_request_handler.cc
@@ -178,7 +178,7 @@ void ServiceWorkerRequestHandler::InitializeHandler(
 }
 
 ServiceWorkerRequestHandler* ServiceWorkerRequestHandler::GetHandler(
-    net::URLRequest* request) {
+    const net::URLRequest* request) {
   return static_cast<ServiceWorkerRequestHandler*>(
       request->GetUserData(&kUserDataKey));
 }
@@ -191,7 +191,7 @@ ServiceWorkerRequestHandler::CreateInterceptor(
 }
 
 bool ServiceWorkerRequestHandler::IsControlledByServiceWorker(
-    net::URLRequest* request) {
+    const net::URLRequest* request) {
   ServiceWorkerRequestHandler* handler = GetHandler(request);
   if (!handler || !handler->provider_host_)
     return false;
@@ -199,6 +199,12 @@ bool ServiceWorkerRequestHandler::IsControlledByServiceWorker(
          handler->provider_host_->running_hosted_version();
 }
 
+ServiceWorkerProviderHost* ServiceWorkerRequestHandler::GetProviderHost(
+    const net::URLRequest* request) {
+  ServiceWorkerRequestHandler* handler = GetHandler(request);
+  return handler ? handler->provider_host_.get() : nullptr;
+}
+
 void ServiceWorkerRequestHandler::PrepareForCrossSiteTransfer(
     int old_process_id) {
   CHECK(!IsBrowserSideNavigationEnabled());