Fix display:none issue for <webview>.

chrome/renderer/resources/extensions/web_view_events.js

Index: chrome/renderer/resources/extensions/web_view_events.js
diff --git a/chrome/renderer/resources/extensions/web_view_events.js b/chrome/renderer/resources/extensions/web_view_events.js
index 546dff294f74349acfd2f42fe8e593585350976c..0331038698faf2f30f91421ffdb1b8694f6c82f9 100644
--- a/chrome/renderer/resources/extensions/web_view_events.js
+++ b/chrome/renderer/resources/extensions/web_view_events.js
@@ -20,6 +20,7 @@ var CreateEvent = function(name) {
 };
 
 var FrameNameChangedEvent = CreateEvent('webViewInternal.onFrameNameChanged');
+var PluginDestroyedEvent = CreateEvent('webViewInternal.onPluginDestroyed');
 var WebRequestMessageEvent = CreateEvent('webViewInternal.onMessage');
 
 // WEB_VIEW_EVENTS is a map of stable <webview> DOM event names to their
@@ -192,6 +193,7 @@ function WebViewEvents(webViewInternal, viewInstanceId) {
 // Sets up events.
 WebViewEvents.prototype.setup = function() {
   this.setupFrameNameChangedEvent();
+  this.setupPluginDestroyedEvent();
   this.setupWebRequestEvents();
   this.webViewInternal.setupExperimentalContextMenus();
 
@@ -208,6 +210,13 @@ WebViewEvents.prototype.setupFrameNameChangedEvent = function() {
   }, {instanceId: self.viewInstanceId});
 };
 
+WebViewEvents.prototype.setupPluginDestroyedEvent = function() {
+  var self = this;
+  PluginDestroyedEvent.addListener(function(e) {
+    self.webViewInternal.onPluginDestroyed();
+  }, {instanceId: self.viewInstanceId});
+};
+
 WebViewEvents.prototype.setupWebRequestEvents = function() {
   var self = this;
   var request = {};