Linux: fix build with system zlib.

net/http/infinite_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/infinite_cache.h"
 
 #include <algorithm>
 
 #include "base/compiler_specific.h"
 #include "base/bind.h"
@@ skipping 10 matching lines @@
 #include "base/rand_util.h"
 #include "base/sha1.h"
 #include "base/time.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "net/base/net_errors.h"
 #include "net/http/http_cache_transaction.h"
 #include "net/http/http_request_info.h"
 #include "net/http/http_response_headers.h"
 #include "net/http/http_response_info.h"
 #include "net/http/http_util.h"
+
+#if defined(USE_SYSTEM_ZLIB)
+#include <zlib.h>
+#else
 #include "third_party/zlib/zlib.h"
+#endif
 
 using base::PlatformFile;
 using base::Time;
 using base::TimeDelta;
 
 namespace {
 
 // Flags to use with a particular resource.
 enum Flags {
   NO_CACHE = 1 << 0,
@@ skipping 1043 matching lines @@
 int InfiniteCache::FlushDataForTest(const CompletionCallback& callback) {
   DCHECK(worker_);
   int* result = new int;
   task_runner_->PostTaskAndReply(
       FROM_HERE, base::Bind(&InfiniteCache::Worker::Flush, worker_, result),
       base::Bind(&OnComplete, callback, base::Owned(result)));
   return net::ERR_IO_PENDING;
 }
 
 }  // namespace net