PreferencesManager

content/public/app/mojo/content_browser_manifest.json

 {
   "name": "content_browser",
   "display_name": "Content (browser process)",
   "interface_provider_specs": {
     "service_manager:connector": {
       "provides": {
         "gpu": [
           "device::mojom::PowerMonitor"
         ],
         "plugin": [
@@ skipping 30 matching lines @@
           "memory_coordinator::mojom::MemoryCoordinatorHandle",
           "payments::mojom::PaymentAppManager"
         ],
         "service_manager:service_factory": [
           "service_manager::mojom::ServiceFactory"
         ]
       },
       "requires": {
         "*": [ "app" ],
         // In classic ash, the browser supplies ash interfaces to itself.
-        "content_browser": [ "ash" ],
+        "content_browser": [ "ash", "prefs:manager" ],
         "content_gpu": [ "browser" ],
         "content_plugin": [ "browser" ],
         "content_renderer": [ "browser" ],
         "content_utility": [ "browser" ],
         "service_manager": [
           "service_manager:client_process",
           "service_manager:instance_name",
           "service_manager:user_id"
         ],
         "file": [ "file:filesystem", "file:leveldb" ],
@@ skipping 32 matching lines @@
           "mojom::MediaDevicesDispatcherHost",
           "payments::mojom::PaymentRequest"
         ]
       },
       "requires": {
         "content_renderer": [ "browser" ]
       }
     }
   }
 }