Remove NOTIFICATION_EXTENSION_ENABLED.

extensions/browser/event_router.cc

Index: extensions/browser/event_router.cc
diff --git a/extensions/browser/event_router.cc b/extensions/browser/event_router.cc
index 72121ead18dcbac98e7369b831b7bf6a4d8e5521..5f01c80a7307afa76ddacc48247dac292097805a 100644
--- a/extensions/browser/event_router.cc
+++ b/extensions/browser/event_router.cc
@@ -17,7 +17,6 @@
 #include "base/metrics/histogram_macros.h"
 #include "base/stl_util.h"
 #include "base/values.h"
-#include "content/public/browser/notification_service.h"
 #include "content/public/browser/render_process_host.h"
 #include "extensions/browser/api_activity_monitor.h"
 #include "extensions/browser/event_router_factory.h"
@@ -27,7 +26,6 @@
 #include "extensions/browser/extension_system.h"
 #include "extensions/browser/extensions_browser_client.h"
 #include "extensions/browser/lazy_background_task_queue.h"
-#include "extensions/browser/notification_types.h"
 #include "extensions/browser/process_manager.h"
 #include "extensions/browser/process_map.h"
 #include "extensions/common/constants.h"
@@ -50,8 +48,6 @@ namespace extensions {
 
 namespace {
 
-void DoNothing(ExtensionHost* host) {}
-
 // A dictionary of event names to lists of filters that this extension has
 // registered from its lazy background page.
 const char kFilteredEvents[] = "filtered_events";
@@ -145,9 +141,6 @@ EventRouter::EventRouter(BrowserContext* browser_context,
       extension_prefs_(extension_prefs),
       extension_registry_observer_(this),
       listeners_(this) {
-  registrar_.Add(this,
-                 extensions::NOTIFICATION_EXTENSION_ENABLED,
-                 content::Source<BrowserContext>(browser_context_));
   extension_registry_observer_.Add(ExtensionRegistry::Get(browser_context_));
 }
 
@@ -753,28 +746,6 @@ void EventRouter::AddFilterToEvent(const std::string& event_name,
   filter_list->Append(filter->CreateDeepCopy());
 }
 
-void EventRouter::Observe(int type,
-                          const content::NotificationSource& source,
-                          const content::NotificationDetails& details) {
-  switch (type) {
-    case extensions::NOTIFICATION_EXTENSION_ENABLED: {
-      // If the extension has a lazy background page, make sure it gets loaded
-      // to register the events the extension is interested in.
-      const Extension* extension =
-          content::Details<const Extension>(details).ptr();
-      if (BackgroundInfo::HasLazyBackgroundPage(extension)) {
-        LazyBackgroundTaskQueue* queue =
-            LazyBackgroundTaskQueue::Get(browser_context_);
-        queue->AddPendingTask(browser_context_, extension->id(),
-                              base::Bind(&DoNothing));
-      }
-      break;
-    }
-    default:
-      NOTREACHED();
-  }
-}
-
 void EventRouter::OnExtensionLoaded(content::BrowserContext* browser_context,
                                     const Extension* extension) {
   // Add all registered lazy listeners to our cache.