Fixing gcc 4.7 building problems.

ppapi/tests/test_broker.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 "ppapi/tests/test_broker.h"
 
 #if defined(_MSC_VER)
 #define OS_WIN 1
 #include <windows.h>
 #else
 #define OS_POSIX 1
 #include <errno.h>
+#include <unistd.h>
 #endif
 
 #include <cstdio>
 #include <cstring>
 #include <fstream>
 #include <limits>
 
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/c/trusted/ppp_broker.h"
 #include "ppapi/c/trusted/ppb_broker_trusted.h"
@@ skipping 256 matching lines @@
 
   PlatformFile file = IntToPlatformFile(handle);
   ASSERT_TRUE(VerifyMessage(file, sizeof(kHelloMessage), kHelloMessage));
   ASSERT_TRUE(VerifyMessage(file, sizeof(kBrokerUnsandboxed),
                             kBrokerUnsandboxed));
 
   ASSERT_TRUE(ClosePlatformFile(file));
 
   PASS();
 }