Implement kiosk multiple apps feature.

chrome/browser/extensions/updater/chromeos_extension_cache_delegate.h

 // Copyright 2015 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_UPDATER_CHROMEOS_EXTENSION_CACHE_DELEGATE_H_
 #define CHROME_BROWSER_EXTENSIONS_UPDATER_CHROMEOS_EXTENSION_CACHE_DELEGATE_H_
 
 #include "base/files/file_path.h"
 #include "base/macros.h"
 #include "chrome/browser/extensions/updater/extension_cache_delegate.h"
 
 namespace extensions {
 
 // Chrome OS-specific implementation, which has a pre-defined extension cache
 // path and a policy-configurable maximum cache size.
 class ChromeOSExtensionCacheDelegate : public ExtensionCacheDelegate {
  public:
   ChromeOSExtensionCacheDelegate();
   explicit ChromeOSExtensionCacheDelegate(const base::FilePath& cache_dir);
 
   const base::FilePath& GetCacheDir() const override;
   size_t GetMaximumCacheSize() const override;
 
  private:
-  const base::FilePath cache_dir_;
+  base::FilePath cache_dir_;
 
   DISALLOW_COPY_AND_ASSIGN(ChromeOSExtensionCacheDelegate);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_UPDATER_CHROMEOS_EXTENSION_CACHE_DELEGATE_H_