Clear disk cache when the cache is not initialized

net/url_request/view_cache_helper.cc

 // Copyright (c) 2006-2008 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 "net/url_request/view_cache_helper.h"
 
 #include "base/string_util.h"
 #include "net/base/escape.h"
 #include "net/base/io_buffer.h"
 #include "net/disk_cache/disk_cache.h"
@@ skipping 98 matching lines @@
   if (!context)
     return NULL;
 
   if (!context->http_transaction_factory())
     return NULL;
 
   net::HttpCache* http_cache = context->http_transaction_factory()->GetCache();
   if (!http_cache)
     return NULL;
 
-  return http_cache->disk_cache();
+  return http_cache->GetBackend();
 }
 
 static std::string FormatStatistics(disk_cache::Backend* disk_cache) {
   std::vector<std::pair<std::string, std::string> > stats;
   disk_cache->GetStats(&stats);
   std::string result;
 
   for (size_t index = 0; index < stats.size(); index++) {
     result.append(stats[index].first);
     result.append(": ");
@@ skipping 38 matching lines @@
 // static
 void ViewCacheHelper::GetStatisticsHTML(URLRequestContext* context,
                                         std::string* data) {
   disk_cache::Backend* disk_cache = GetDiskCache(context);
   if (!disk_cache) {
     data->append("no disk cache");
     return;
   }
   data->append(FormatStatistics(disk_cache));
 }