cleanup: Use EventRouter instead of ExtensionSystem::Get->event_router()

chrome/browser/extensions/api/automation_internal/automation_internal_api.cc

Index: chrome/browser/extensions/api/automation_internal/automation_internal_api.cc
diff --git a/chrome/browser/extensions/api/automation_internal/automation_internal_api.cc b/chrome/browser/extensions/api/automation_internal/automation_internal_api.cc
index 26d0595d5701c221a9ca869a61f4daefe8b9c529..18f2ad459e52c974b2036cd7f56072df44544a6e 100644
--- a/chrome/browser/extensions/api/automation_internal/automation_internal_api.cc
+++ b/chrome/browser/extensions/api/automation_internal/automation_internal_api.cc
@@ -25,7 +25,6 @@
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/web_contents.h"
 #include "extensions/browser/event_router.h"
-#include "extensions/browser/extension_system.h"
 #include "ui/accessibility/ax_enums.h"
 #include "ui/accessibility/ax_node_data.h"
 
@@ -45,11 +44,13 @@ namespace {
 void DispatchEvent(content::BrowserContext* context,
                    const std::string& event_name,
                    scoped_ptr<base::ListValue> args) {
-  if (context && extensions::ExtensionSystem::Get(context)->event_router()) {
-    scoped_ptr<Event> event(new Event(event_name, args.Pass()));
-    event->restrict_to_browser_context = context;
-    ExtensionSystem::Get(context)->event_router()->BroadcastEvent(event.Pass());
-  }
+  EventRouter* event_router = EventRouter::Get(context);
+  if (!event_router)
+    return;
+
+  scoped_ptr<Event> event(new Event(event_name, args.Pass()));
+  event->restrict_to_browser_context = context;
+  event_router->BroadcastEvent(event.Pass());
 }
 
 }  // namespace