<webview>: Cleanup WebRequest event listeners when embedder destroyed

content/browser/browser_plugin/browser_plugin_guest.h

Index: content/browser/browser_plugin/browser_plugin_guest.h
diff --git a/content/browser/browser_plugin/browser_plugin_guest.h b/content/browser/browser_plugin/browser_plugin_guest.h
index 15d28d27b10172e2c7d2d8926e2ec7bc80587f75..dcabd6dd0910dfa696f5db6329c477a2fbf27e45 100644
--- a/content/browser/browser_plugin/browser_plugin_guest.h
+++ b/content/browser/browser_plugin/browser_plugin_guest.h
@@ -104,6 +104,10 @@ class CONTENT_EXPORT BrowserPluginGuest
       BrowserPluginGuest* opener,
       bool has_render_view);
 
+  // Called when the embedder RenderViewHost is destroyed to give the
+  // BrowserPluginGuest an opportunity to clean up after itself.
+  void EmbedderDestroyed();
+
   // Destroys the guest WebContents and all its associated state, including
   // this BrowserPluginGuest, and its new unattached windows.
   void Destroy();