Stop sending events and messages to content script contexts after their

chrome/renderer/extensions/chrome_v8_context_set.h

Index: chrome/renderer/extensions/chrome_v8_context_set.h
diff --git a/chrome/renderer/extensions/chrome_v8_context_set.h b/chrome/renderer/extensions/chrome_v8_context_set.h
index 7454e82919f1edb1a5c8a8beb4555756cbe62b29..44d37797836037c8d4de1539ed7f7b69ef443345 100644
--- a/chrome/renderer/extensions/chrome_v8_context_set.h
+++ b/chrome/renderer/extensions/chrome_v8_context_set.h
@@ -69,6 +69,9 @@ class ChromeV8ContextSet {
                                   content::RenderView* render_view,
                                   const GURL& event_url) const;
 
+  // Cleans up contexts belonging to an unloaded extension.
+  void OnExtensionUnloaded(const std::string& extension_id);
+
  private:
   ContextSet contexts_;