Change the NaCl loader and broker processes to use the ServiceManager.

headless/lib/browser/headless_content_browser_client.cc

Index: headless/lib/browser/headless_content_browser_client.cc
diff --git a/headless/lib/browser/headless_content_browser_client.cc b/headless/lib/browser/headless_content_browser_client.cc
index e81f084f25b32fe54b04373b9ae1ac5e368addb0..101d15c662f0386a2cd05b37a7ebdae88f5f885c 100644
--- a/headless/lib/browser/headless_content_browser_client.cc
+++ b/headless/lib/browser/headless_content_browser_client.cc
@@ -63,7 +63,7 @@ HeadlessContentBrowserClient::GetDevToolsManagerDelegate() {
 
 std::unique_ptr<base::Value>
 HeadlessContentBrowserClient::GetServiceManifestOverlay(
-    const std::string& name) {
+    base::StringPiece name) {
   if (name != content::mojom::kBrowserServiceName ||
       browser_->options()->mojo_service_names.empty())
     return nullptr;