[win] Enable ModuleDatabase behind a flag.

chrome/browser/chrome_content_browser_manifest_overlay.json

 {
   "name": "content_browser",
   "display_name": "Chrome",
   "interface_provider_specs": {
     "service_manager:connector": {
       "provides": {
         "renderer": [
           "autofill::mojom::AutofillDriver",
           "autofill::mojom::PasswordManagerDriver",
           "chrome::mojom::NetBenchmarking",
           "chrome::mojom::FieldTrialRecorder",
           "extensions::StashService",
           "metrics::mojom::LeakDetector",
+          "mojom::ModuleEventSink",
           "rappor::mojom::RapporRecorder",
           "startup_metric_utils::mojom::StartupMetricHost",
           "translate::mojom::ContentTranslateDriver"
         ],
         "gpu": [
           "metrics::mojom::CallStackProfileCollector"
         ],
         "ash": [
           // Under classic ash the browser provides some of the ash interfaces
           // to itself.
@@ skipping 52 matching lines @@
           // TODO(beng): These should be moved to a separate capability.
           "mojom::OmniboxPageHandler",
           "mojom::PluginsPageHandler",
           "mojom::SiteEngagementUIHandler",
           "mojom::UsbInternalsPageHandler"
         ]
       }
     }
   }
 }