Remove chrome::NOTIFICATION_WEB_DIALOG_SHOWN.

chrome/browser/ui/webui/web_dialog_delegate.h

Index: chrome/browser/ui/webui/web_dialog_delegate.h
diff --git a/chrome/browser/ui/webui/web_dialog_delegate.h b/chrome/browser/ui/webui/web_dialog_delegate.h
index b72e607b25704a357a0f8bc3c763fd6786ab0578..12ebadaca160c5c73ce3e1e084e4872afa13a181 100644
--- a/chrome/browser/ui/webui/web_dialog_delegate.h
+++ b/chrome/browser/ui/webui/web_dialog_delegate.h
@@ -16,8 +16,10 @@
 class GURL;
 
 namespace content {
-class WebUIMessageHandler;
+class RenderViewHost;
 class WebContents;
+class WebUI;
+class WebUIMessageHandler;
 struct ContextMenuParams;
 struct OpenURLParams;
 }
@@ -63,6 +65,12 @@ class WebDialogDelegate {
   // changed.
   virtual void OnLoadingStateChanged(content::WebContents* source) {}
 
+  // A callback to notify the delegate that a web dialog has been shown.
+  // |webui| is the WebUI with which the dialog is associated.
+  // |render_view_host| is the RenderViewHost for the shown dialog.
+  virtual void OnDialogShown(content::WebUI* webui,
+                             content::RenderViewHost* render_view_host) {}
+
   // A callback to notify the delegate that the dialog closed.
   // IMPORTANT: Implementations should delete |this| here (unless they've
   // arranged for the delegate to be deleted in some other way, e.g. by