Unify the three places that patch font loading for PDFium on Windows.

content/renderer/service_worker/embedded_worker_context_client.cc

Index: content/renderer/service_worker/embedded_worker_context_client.cc
diff --git a/content/renderer/service_worker/embedded_worker_context_client.cc b/content/renderer/service_worker/embedded_worker_context_client.cc
index d04fc06aaf3ebe89ea362ab2c4be854d9e55d73d..2c50e5c023e927875674c91b5fed244619bca193 100644
--- a/content/renderer/service_worker/embedded_worker_context_client.cc
+++ b/content/renderer/service_worker/embedded_worker_context_client.cc
@@ -103,7 +103,7 @@ EmbeddedWorkerContextClient::EmbeddedWorkerContextClient(
       service_worker_scope_(service_worker_scope),
       script_url_(script_url),
       worker_devtools_agent_route_id_(worker_devtools_agent_route_id),
-      sender_(ChildThread::current()->thread_safe_sender()),
+      sender_(ChildThreadImpl::current()->thread_safe_sender()),
       main_thread_proxy_(base::MessageLoopProxy::current()),
       weak_factory_(this) {
   TRACE_EVENT_ASYNC_BEGIN0("ServiceWorker",