Stop warnings resulting from unimplemented SetProcessBackgrounded().

base/process/process_posix.cc

 // Copyright 2011 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 "base/process/process.h"
 
 #include <sys/resource.h>
 #include <sys/wait.h>
 
 #include "base/files/scoped_file.h"
@@ skipping 346 matching lines @@
 }
 
 #if !defined(OS_LINUX)
 bool Process::IsProcessBackgrounded() const {
   // See SetProcessBackgrounded().
   DCHECK(IsValid());
   return false;
 }
 
 bool Process::SetProcessBackgrounded(bool value) {
-  // Not implemented for POSIX systems other than Mac and Linux. With POSIX, if
-  // we were to lower the process priority we wouldn't be able to raise it back
-  // to its initial priority.
+  // Not implemented for POSIX systems other than Linux. With POSIX, if we were
+  // to lower the process priority we wouldn't be able to raise it back to its
+  // initial priority.
   NOTIMPLEMENTED();
   return false;
 }
 #endif  // !defined(OS_LINUX)
 
 int Process::GetPriority() const {
   DCHECK(IsValid());
   return getpriority(PRIO_PROCESS, process_);
 }
 
 }  // namespace base