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

chrome/browser/extensions/extension_blacklist_browsertest.cc

 // Copyright 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 "base/run_loop.h"
 #include "base/stringprintf.h"
 #include "chrome/browser/extensions/blacklist.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_system.h"
@@ skipping 65 matching lines @@
   }
 
  private:
   // content::NotificationObserver implementation.
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE {
     switch (type) {
       case chrome::NOTIFICATION_EXTENSION_INSTALLED: {
         const Extension* extension =
-            content::Details<const Extension>(details).ptr();
+            content::Details<const InstalledExtensionInfo>(details)->extension;
         if (extension_ids_.count(extension->id()))
           notifications_.push_back(static_cast<chrome::NotificationType>(type));
         break;
       }
 
       case chrome::NOTIFICATION_EXTENSION_LOADED: {
         const Extension* extension =
             content::Details<const Extension>(details).ptr();
         if (extension_ids_.count(extension->id()))
           notifications_.push_back(static_cast<chrome::NotificationType>(type));
@@ skipping 290 matching lines @@
 
   EXPECT_TRUE(IsBlacklisted(extension_a));
   EXPECT_TRUE(IsSafe(extension_b));
   EXPECT_TRUE(IsBlacklisted(extension_c));
   EXPECT_TRUE(notifications.CheckNotifications(
         chrome::NOTIFICATION_EXTENSION_LOADED,
         chrome::NOTIFICATION_EXTENSION_UNLOADED));
 }
 
 }  // namespace extensions