Linux: Enable metrics_service_uitest.cc. Take 2.

base/process.h

 // Copyright (c) 2006-2008 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.
 
 #ifndef BASE_PROCESS_H_
 #define BASE_PROCESS_H_
 
 #include "base/basictypes.h"
+#include "build/build_config.h"
 
 #include <sys/types.h>
 #ifdef OS_WIN
 #include <windows.h>
 #endif
 
 namespace base {
 
 // ProcessHandle is a platform specific type which represents the underlying OS
 // handle to a process.
@@ skipping 65 matching lines @@
   bool EmptyWorkingSet();
 
  private:
   ProcessHandle process_;
   size_t last_working_set_size_;
 };
 
 }  // namespace base
 
 #endif  // BASE_PROCESS_H_