Convert utility process out-of-process file patching to mojo

chrome/browser/chrome_content_utility_manifest_overlay.json

 {
   "name": "content_utility",
   "interface_provider_specs": {
     "service_manager:connector": {
       "provides": {
         "browser": [
+          "chrome::mojom::FilePatcher",
           "chrome::mojom::ProfileImport",
           "chrome::mojom::ResourceUsageReporter",
           "chrome::mojom::ShellHandler",
           "net::interfaces::ProxyResolverFactory",
           "safe_json::mojom::SafeJsonParser"
         ]
       }
     }
   }
 }