headless: Add a browser manifest overlay

headless/lib/browser/headless_browser_manifest_overlay.json

Index: headless/lib/browser/headless_browser_manifest_overlay.json
diff --git a/blimp/engine/app/blimp_content_browser_manifest_overlay.json b/headless/lib/browser/headless_browser_manifest_overlay.json
similarity index 63%
copy from blimp/engine/app/blimp_content_browser_manifest_overlay.json
copy to headless/lib/browser/headless_browser_manifest_overlay.json
index 936d1c34e4a9f02c3db14bdf1ee226f667058aa1..07064928f2a4c849a9b3ef6d7f5630c1c4ee1f7c 100644
--- a/blimp/engine/app/blimp_content_browser_manifest_overlay.json
+++ b/headless/lib/browser/headless_browser_manifest_overlay.json
@@ -1,10 +1,10 @@
 {
   "name": "service:content_browser",
   "interface_provider_specs": {
-    "service_manager:connector": {
+    "navigation:frame": {
       "provides": {
         "renderer": [
-          "blimp::engine::mojom::BlobChannel"
+          "embedder_test::TestEmbedderService"
         ]
       }
     }