Move Extension into extensions namespace

chrome/browser/ui/panels/panel_app_browsertest.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 "base/command_line.h"
 #include "base/file_path.h"
 #include "chrome/browser/extensions/extension_browsertest.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser.h"
@@ skipping 24 matching lines @@
     // can close correctly. The NSWindowController of the Panel window controls
     // lifetime of the Browser object so we want to release it as soon as
     // possible. In real Chrome, this is done by message pump.
     // On non-Mac platform, this is an empty class.
     base::mac::ScopedNSAutoreleasePool autorelease_pool;
 #endif
 
     EXPECT_TRUE(LoadExtension(test_data_dir_.AppendASCII(name)));
 
     ExtensionService* service = browser()->profile()->GetExtensionService();
-    const Extension* extension = service->GetExtensionById(
+    const extensions::Extension* extension = service->GetExtensionById(
         last_loaded_extension_id_, false);
     EXPECT_TRUE(extension);
 
     size_t browser_count = BrowserList::size();
 
     Browser::OpenApplication(
         browser()->profile(),
         extension,
         // Overriding manifest to open in a panel.
         extension_misc::LAUNCH_PANEL,
@@ skipping 43 matching lines @@
   EXPECT_TRUE(new_browser->is_type_panel());
 
   // Now also check that PanelManager has one new Panel under management.
   EXPECT_EQ(1, panel_manager->num_panels());
 
   CloseWindowAndWait(new_browser);
 
   EXPECT_EQ(0, panel_manager->num_panels());
   EXPECT_EQ(1u, BrowserList::size());
 }