<webview>: Context menu API implementation CL.

chrome/browser/guestview/webview/webview_guest.cc

Index: chrome/browser/guestview/webview/webview_guest.cc
diff --git a/chrome/browser/guestview/webview/webview_guest.cc b/chrome/browser/guestview/webview/webview_guest.cc
index 8f72d4257fbbbbda77ba549e51fc60191ac42764..238c0ce09de2403434e852af5cc3fe1a45a0c47c 100644
--- a/chrome/browser/guestview/webview/webview_guest.cc
+++ b/chrome/browser/guestview/webview/webview_guest.cc
@@ -10,6 +10,7 @@
 #include "chrome/browser/extensions/api/webview/webview_api.h"
 #include "chrome/browser/extensions/extension_renderer_state.h"
 #include "chrome/browser/extensions/extension_web_contents_observer.h"
+#include "chrome/browser/extensions/menu_manager.h"
 #include "chrome/browser/extensions/script_executor.h"
 #include "chrome/browser/favicon/favicon_tab_helper.h"
 #include "chrome/browser/guestview/guestview_constants.h"
@@ -682,6 +683,12 @@ void WebViewGuest::DidStopLoading(content::RenderViewHost* render_view_host) {
 }
 
 void WebViewGuest::WebContentsDestroyed(WebContents* web_contents) {
+  // Clean up custom context menu items for this guest.
+  extensions::MenuManager* menu_manager = extensions::MenuManager::Get(
+      Profile::FromBrowserContext(browser_context()));
+  menu_manager->RemoveAllWebviewContextItems(extension_id(),
+                                             view_instance_id());
+
   RemoveWebViewFromExtensionRendererState(web_contents);
 }