[Extensions Page] Add a listener on extension list for "hasExtensions" changing

chrome/browser/extensions/api/developer_private/developer_private_api.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 "chrome/browser/extensions/api/developer_private/developer_private_api.h"
 
 #include "base/base64.h"
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/lazy_instance.h"
@@ skipping 266 matching lines @@
 
 void DeveloperPrivateEventRouter::OnExtensionUnloaded(
     content::BrowserContext* browser_context,
     const Extension* extension,
     UnloadedExtensionInfo::Reason reason) {
   DCHECK(profile_->IsSameProfile(Profile::FromBrowserContext(browser_context)));
   BroadcastItemStateChanged(
       browser_context, developer::EVENT_TYPE_UNLOADED, extension->id());
 }
 
-void DeveloperPrivateEventRouter::OnExtensionWillBeInstalled(
+void DeveloperPrivateEventRouter::OnExtensionInstalled(
     content::BrowserContext* browser_context,
     const Extension* extension,
-    bool is_update,
-    bool from_ephemeral,
-    const std::string& old_name) {
+    bool is_update) {
   DCHECK(profile_->IsSameProfile(Profile::FromBrowserContext(browser_context)));
   BroadcastItemStateChanged(
       browser_context, developer::EVENT_TYPE_INSTALLED, extension->id());
 }
 
 void DeveloperPrivateEventRouter::OnExtensionUninstalled(
     content::BrowserContext* browser_context,
     const Extension* extension,
     extensions::UninstallReason reason) {
   DCHECK(profile_->IsSameProfile(Profile::FromBrowserContext(browser_context)));
@@ skipping 1070 matching lines @@
   // We explicitly show manifest.json in order to work around an issue in OSX
   // where opening the directory doesn't focus the Finder.
   platform_util::ShowItemInFolder(GetProfile(),
                                   extension->path().Append(kManifestFilename));
   return RespondNow(NoArguments());
 }
 
 }  // namespace api
 
 }  // namespace extensions