Stop sending events and messages to content script contexts after their

chrome/renderer/extensions/dispatcher.cc

Index: chrome/renderer/extensions/dispatcher.cc
diff --git a/chrome/renderer/extensions/dispatcher.cc b/chrome/renderer/extensions/dispatcher.cc
index c8bde59a60bdf40bb4aab66f55c290a933fd5ae9..8d5aa46be680cc3f0cc83e31da6df41c0a7e41d2 100644
--- a/chrome/renderer/extensions/dispatcher.cc
+++ b/chrome/renderer/extensions/dispatcher.cc
@@ -504,6 +504,8 @@ void Dispatcher::OnUnloaded(const std::string& id) {
   // changed origin whitelist.
   user_script_slave_->RemoveIsolatedWorld(id);
 
+  v8_context_set_.OnExtensionUnloaded(id);
+
   // We don't do anything with existing platform-app stylesheets. They will
   // stay resident, but the URL pattern corresponding to the unloaded
   // extension's URL just won't match anything anymore.