<webview>: Cleanup WebRequest event listeners when embedder destroyed

content/browser/browser_plugin/browser_plugin_guest.cc

Index: content/browser/browser_plugin/browser_plugin_guest.cc
diff --git a/content/browser/browser_plugin/browser_plugin_guest.cc b/content/browser/browser_plugin/browser_plugin_guest.cc
index 83f2b3c950b9d80bff1e586fb773bb9731527117..fb053c91c73051ddfc62ac9977ac7bae719db2d8 100644
--- a/content/browser/browser_plugin/browser_plugin_guest.cc
+++ b/content/browser/browser_plugin/browser_plugin_guest.cc
@@ -319,8 +319,7 @@ class BrowserPluginGuest::EmbedderRenderViewHostObserver
   // RenderViewHostObserver:
   virtual void RenderViewHostDestroyed(
       RenderViewHost* render_view_host) OVERRIDE {
-    browser_plugin_guest_->embedder_web_contents_ = NULL;
-    browser_plugin_guest_->Destroy();
+    browser_plugin_guest_->EmbedderDestroyed();
   }
 
  private:
@@ -424,6 +423,13 @@ int BrowserPluginGuest::RequestPermission(
   return request_id;
 }
 
+void BrowserPluginGuest::EmbedderDestroyed() {
+  embedder_web_contents_ = NULL;
+  if (delegate_)
+    delegate_->EmbedderDestroyed();
+  Destroy();
+}
+
 void BrowserPluginGuest::Destroy() {
   is_in_destruction_ = true;
   if (!attached() && opener())