add missing header.

chrome/common/multi_process_lock_linux.cc

 // Copyright (c) 2010 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/common/multi_process_lock.h"
 
+#include <stdio.h>
 #include <sys/socket.h>
 #include <sys/un.h>
 #include <unistd.h>
 
 #include "base/eintr_wrapper.h"
 #include "base/logging.h"
 
 class MultiProcessLockLinux : public MultiProcessLock {
  public:
   explicit MultiProcessLockLinux(const std::string& name)
@@ skipping 81 matching lines @@
 
  private:
   std::string name_;
   int fd_;
   DISALLOW_COPY_AND_ASSIGN(MultiProcessLockLinux);
 };
 
 MultiProcessLock* MultiProcessLock::Create(const std::string &name) {
   return new MultiProcessLockLinux(name);
 }