Create CrxInstaller directly in WebstoreInstaller

chrome/browser/download/download_crx_util_android.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.
 //
 // Download code which handles CRX files (extensions, themes, apps, ...).
 
 #include "chrome/browser/download/download_crx_util.h"
 #include "chrome/browser/extensions/crx_installer.h"
 #include "chrome/browser/profiles/profile.h"
 #include "content/public/browser/download_item.h"
 
 using content::BrowserThread;
 using content::DownloadItem;
 
 namespace download_crx_util {
 
+scoped_refptr<extensions::CrxInstaller> CreateCrxInstaller(
+    Profile* profile,
+    const content::DownloadItem& download_item) {
+  NOTIMPLEMENTED() << "CrxInstaller not implemented on Android";
+  scoped_refptr<extensions::CrxInstaller> installer(
+      extensions::CrxInstaller::CreateSilent(NULL));
+  return installer;
+}
+
 void SetMockInstallPromptForTesting(ExtensionInstallPrompt* mock_prompt) {
   NOTIMPLEMENTED();
 }
 
 scoped_refptr<extensions::CrxInstaller> OpenChromeExtension(
     Profile* profile,
     const DownloadItem& download_item) {
   NOTIMPLEMENTED() << "CrxInstaller not implemented on Android";
   scoped_refptr<extensions::CrxInstaller> installer(
       extensions::CrxInstaller::CreateSilent(NULL));
   return installer;
 }
 
 bool IsExtensionDownload(const DownloadItem& download_item) {
   // Extensions are not supported on Android. We want to treat them as
   // normal file downloads.
   return false;
 }
 
 bool OffStoreInstallAllowedByPrefs(Profile* profile,
                                    const content::DownloadItem& item) {
   // Extensions are not supported on Android, return the safe default.
   return false;
 }
 
 }  // namespace download_crx_util