Try run for https://codereview.chromium.org/426593007.

extensions/browser/event_router.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "extensions/browser/event_router.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/command_line.h"
@@ skipping 521 matching lines @@
   }
 }
 
 void EventRouter::DispatchEventToProcess(const std::string& extension_id,
                                          const GURL& listener_url,
                                          content::RenderProcessHost* process,
                                          const linked_ptr<Event>& event) {
   BrowserContext* listener_context = process->GetBrowserContext();
   ProcessMap* process_map = ProcessMap::Get(listener_context);
 
+  // TODO(kalman): Convert this method to use ProcessMap::GuessContextType.
+
   const Extension* extension =
       ExtensionRegistry::Get(browser_context_)->enabled_extensions().GetByID(
           extension_id);
   // NOTE: |extension| being NULL does not necessarily imply that this event
   // shouldn't be dispatched. Events can be dispatched to WebUI as well.
 
   if (!extension && !extension_id.empty()) {
     // Trying to dispatch an event to an extension that doesn't exist. The
     // extension could have been removed, but we do not unregister it until the
     // extension process is unloaded.
@@ skipping 258 matching lines @@
                                      const std::string& extension_id,
                                      const GURL& listener_url,
                                      content::BrowserContext* browser_context)
     : event_name(event_name),
       extension_id(extension_id),
       listener_url(listener_url),
       browser_context(browser_context) {
 }
 
 }  // namespace extensions