Move Extension into extensions namespace

chrome/browser/extensions/api/terminal/terminal_extension_helper.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/terminal/terminal_extension_helper.h"
 
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/extensions/extension.h"
 
 namespace {
 
 const char kCroshExtensionEntryPoint[] = "/html/crosh.html";
 
-const Extension* GetTerminalExtension(Profile* profile) {
+const extensions::Extension* GetTerminalExtension(Profile* profile) {
   // Search order for terminal extensions.
   // We prefer hterm-dev, then hterm, then the builtin crosh extension.
   static const char* kPossibleAppIds[] = {
     extension_misc::kHTermDevAppId,
     extension_misc::kHTermAppId,
     extension_misc::kCroshBuiltinAppId,
   };
 
   // The hterm-dev should be first in the list.
   DCHECK_EQ(kPossibleAppIds[0], extension_misc::kHTermDevAppId);
 
   ExtensionService* service = profile->GetExtensionService();
   for (size_t x = 0; x < arraysize(kPossibleAppIds); ++x) {
-    const Extension* extension = service->GetExtensionById(
+    const extensions::Extension* extension = service->GetExtensionById(
         kPossibleAppIds[x], false);
     if (extension)
       return extension;
   }
 
   return NULL;
 }
 
 }  // namespace
 
 GURL TerminalExtensionHelper::GetCroshExtensionURL(Profile* profile) {
-  const Extension* extension = GetTerminalExtension(profile);
+  const extensions::Extension* extension = GetTerminalExtension(profile);
   if (!extension)
     return GURL();
 
   return extension->GetResourceURL(kCroshExtensionEntryPoint);
 }