Change the API of disk_cache::CreateCacheBackend to use scoped_ptr

chrome/browser/nacl_host/pnacl_translation_cache.cc

 // Copyright 2013 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/nacl_host/pnacl_translation_cache.h"
 
 #include <string>
 
 #include "base/files/file_path.h"
 #include "base/logging.h"
@@ skipping 265 matching lines @@
   }
 }
 
 //////////////////////////////////////////////////////////////////////
 void PnaclTranslationCache::OpComplete(PnaclTranslationCacheEntry* entry) {
   open_entries_.erase(entry);
 }
 
 //////////////////////////////////////////////////////////////////////
 // Construction and cache backend initialization
-PnaclTranslationCache::PnaclTranslationCache()
-    : disk_cache_(NULL), in_memory_(false) {}
+PnaclTranslationCache::PnaclTranslationCache() : in_memory_(false) {}
 
-PnaclTranslationCache::~PnaclTranslationCache() { delete disk_cache_; }
+PnaclTranslationCache::~PnaclTranslationCache() {}
 
 int PnaclTranslationCache::InitWithDiskBackend(
     const base::FilePath& cache_dir,
     int cache_size,
     const CompletionCallback& callback) {
   return Init(net::DISK_CACHE, cache_dir, cache_size, callback);
 }
 
 int PnaclTranslationCache::InitWithMemBackend(
     int cache_size,
@@ skipping 72 matching lines @@
   return rv;
 }
 
 int PnaclTranslationCache::Size() {
   if (!disk_cache_)
     return -1;
   return disk_cache_->GetEntryCount();
 }
 
 }  // namespace pnacl