Made it possible to tell whether an extension is being installed or updated.

chrome/browser/extensions/api/push_messaging/push_messaging_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/push_messaging/push_messaging_api.h"
 
 #include <set>
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
@@ skipping 298 matching lines @@
     return;
 
   if (!event_router_)
     event_router_.reset(new PushMessagingEventRouter(profile_));
   if (!handler_) {
     handler_.reset(new PushMessagingInvalidationHandler(
         pss, event_router_.get()));
   }
   switch (type) {
     case chrome::NOTIFICATION_EXTENSION_INSTALLED: {
-      const Extension* extension = content::Details<Extension>(details).ptr();
+      const Extension* extension =
+          content::Details<const InstalledExtensionInfo>(details)->extension;
       if (extension->HasAPIPermission(APIPermission::kPushMessaging)) {
         handler_->SuppressInitialInvalidationsForExtension(extension->id());
       }
       break;
     }
     case chrome::NOTIFICATION_EXTENSION_LOADED: {
       const Extension* extension = content::Details<Extension>(details).ptr();
       if (extension->HasAPIPermission(APIPermission::kPushMessaging)) {
         handler_->RegisterExtension(extension->id());
       }
@@ skipping 17 matching lines @@
   handler_ = mapper.Pass();
 }
 
 template <>
 void ProfileKeyedAPIFactory<PushMessagingAPI>::DeclareFactoryDependencies() {
   DependsOn(ExtensionSystemFactory::GetInstance());
   DependsOn(ProfileSyncServiceFactory::GetInstance());
 }
 
 }  // namespace extensions