Revert of Remove reference counting from HttpNetworkSession.

net/http/mock_http_cache.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.
 
 #include "net/http/mock_http_cache.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/thread_task_runner_handle.h"
@@ skipping 501 matching lines @@
 
 int MockBackendFactory::CreateBackend(NetLog* net_log,
                                       scoped_ptr<disk_cache::Backend>* backend,
                                       const CompletionCallback& callback) {
   backend->reset(new MockDiskCache());
   return OK;
 }
 
 //-----------------------------------------------------------------------------
 
-MockHttpCache::MockHttpCache() : MockHttpCache(new MockBackendFactory()) {}
+MockHttpCache::MockHttpCache()
+    : http_cache_(new MockNetworkLayer(), NULL, new MockBackendFactory()) {
+}
 
 MockHttpCache::MockHttpCache(HttpCache::BackendFactory* disk_cache_factory)
-    : http_cache_(new MockNetworkLayer(), nullptr, disk_cache_factory, true) {}
+    : http_cache_(new MockNetworkLayer(), NULL, disk_cache_factory) {
+}
 
 disk_cache::Backend* MockHttpCache::backend() {
   TestCompletionCallback cb;
   disk_cache::Backend* backend;
   int rv = http_cache_.GetBackend(&backend, cb.callback());
   rv = cb.GetResult(rv);
   return (rv == OK) ? backend : NULL;
 }
 
 MockDiskCache* MockHttpCache::disk_cache() {
@@ skipping 122 matching lines @@
   if (!callback_.is_null()) {
     if (!fail_)
       backend_->reset(new MockDiskCache());
     CompletionCallback cb = callback_;
     callback_.Reset();
     cb.Run(Result());  // This object can be deleted here.
   }
 }
 
 }  // namespace net