Split DownloadItem into an ABC, an Impl, and a Mock.

chrome/browser/download/download_crx_util.cc

 // Copyright (c) 2011 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.
 //
 // Download code which handles CRX files (extensions, themes, apps, ...).
 
 #include "chrome/browser/download/download_util.h"
 #include "chrome/browser/extensions/crx_installer.h"
 #include "chrome/browser/extensions/extension_install_ui.h"
 #include "chrome/browser/extensions/extension_service.h"
@@ skipping 43 matching lines @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   ExtensionService* service = profile->GetExtensionService();
   CHECK(service);
 
   scoped_refptr<CrxInstaller> installer(
       CrxInstaller::Create(service, CreateExtensionInstallUI(profile)));
   installer->set_delete_source(true);
 
   if (UserScript::IsURLUserScript(download_item.GetURL(),
-                                  download_item.mime_type())) {
-    installer->InstallUserScript(download_item.full_path(),
+                                  download_item.GetMimeType())) {
+    installer->InstallUserScript(download_item.GetFullPath(),
                                  download_item.GetURL());
   } else {
     bool is_gallery_download = service->IsDownloadFromGallery(
-        download_item.GetURL(), download_item.referrer_url());
-    installer->set_original_mime_type(download_item.original_mime_type());
+        download_item.GetURL(), download_item.GetReferrerUrl());
+    installer->set_original_mime_type(download_item.GetOriginalMimeType());
     installer->set_apps_require_extension_mime_type(true);
     installer->set_download_url(download_item.GetURL());
     installer->set_is_gallery_install(is_gallery_download);
     if (is_gallery_download)
-      installer->set_original_download_url(download_item.original_url());
+      installer->set_original_download_url(download_item.GetOriginalUrl());
     installer->set_allow_silent_install(is_gallery_download);
     installer->set_install_cause(extension_misc::INSTALL_CAUSE_USER_DOWNLOAD);
-    installer->InstallCrx(download_item.full_path());
+    installer->InstallCrx(download_item.GetFullPath());
   }
 
   return installer;
 }
 
 }  // namespace download_crx_util