Clean up header files.

chrome/browser/process_singleton_posix_unittest.cc

 // Copyright 2014 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/process_singleton.h"
 
 #include <fcntl.h>
+#include <limits.h>
 #include <signal.h>
 #include <stddef.h>
 #include <sys/types.h>
 #include <sys/un.h>
 #include <sys/wait.h>
 #include <unistd.h>
 
 #include <string>
 #include <vector>
 
@@ skipping 405 matching lines @@
 // Test that if there is an existing lock file, and it's not locked, we replace
 // it.
 TEST_F(ProcessSingletonPosixTest, CreateReplacesOldMacLock) {
   scoped_ptr<TestableProcessSingleton> process_singleton(
       CreateProcessSingleton());
   EXPECT_EQ(0, base::WriteFile(lock_path_, "", 0));
   EXPECT_TRUE(process_singleton->Create());
   VerifyFiles();
 }
 #endif  // defined(OS_MACOSX)