Make browser process a singleton service

content/public/app/BUILD.gn

Index: content/public/app/BUILD.gn
diff --git a/content/public/app/BUILD.gn b/content/public/app/BUILD.gn
index 98d7362d8d194ecfbcad765743ed2497b0e3ff00..7ea74d83c2ba13973d2194da7c72e818ef662e2d 100644
--- a/content/public/app/BUILD.gn
+++ b/content/public/app/BUILD.gn
@@ -174,17 +174,22 @@ if (is_component_build) {
   }
 }
 
-service_manifest("browser_manifest") {
-  name = "content_browser"
-  source = "mojo/content_browser_manifest.json"
+service_manifest("packaged_services_manifest") {
+  name = "content_packaged_services"
+  source = "mojo/content_packaged_services_manifest.json"
   packaged_services = [
     "//media/mojo/services:media_manifest",
     "//services/device:manifest",
-    "//services/file:manifest",
     "//services/shape_detection:manifest",
   ]
 }
 
+service_manifest("browser_manifest") {
+  name = "content_browser"
+  source = "mojo/content_browser_manifest.json"
+  packaged_services = [ "//services/file:manifest" ]
+}
+
 service_manifest("gpu_manifest") {
   name = "content_gpu"
   source = "mojo/content_gpu_manifest.json"