[win] Enable ModuleDatabase behind a flag.

chrome/renderer/chrome_content_renderer_client.h

Index: chrome/renderer/chrome_content_renderer_client.h
diff --git a/chrome/renderer/chrome_content_renderer_client.h b/chrome/renderer/chrome_content_renderer_client.h
index 024b926594b8399bc6f48f47c31a2eb423a98783..96e564612a1643f12043afff1e115f7b7cf8eb57 100644
--- a/chrome/renderer/chrome_content_renderer_client.h
+++ b/chrome/renderer/chrome_content_renderer_client.h
@@ -30,6 +30,11 @@
 #include "chrome/renderer/leak_detector/leak_detector_remote_client.h"
 #endif
 
+#if defined(OS_WIN)
+#include "chrome/common/conflicts/module_event_sink_win.mojom.h"
+#include "chrome/common/conflicts/module_watcher_win.h"
+#endif
+
 class ChromeRenderThreadObserver;
 #if BUILDFLAG(ENABLE_PRINT_PREVIEW)
 class ChromePDFPrintClient;
@@ -254,6 +259,13 @@ class ChromeContentRendererClient : public content::ContentRendererClient {
   std::unique_ptr<LeakDetectorRemoteClient> leak_detector_remote_client_;
 #endif
 
+#if defined(OS_WIN)
+  // Observes module load and unload events and notifies the ModuleDatabase in
+  // the browser process.
+  std::unique_ptr<ModuleWatcher> module_watcher_;
+  mojom::ModuleEventSinkPtr module_event_sink_;
+#endif
+
   DISALLOW_COPY_AND_ASSIGN(ChromeContentRendererClient);
 };