Cleanup: Fix content header include guards.

content/zygote/zygote_linux.h

 // 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.
 
-#ifndef CONTENT_ZYGOTE_ZYGOTE_H_
-#define CONTENT_ZYGOTE_ZYGOTE_H_
+#ifndef CONTENT_ZYGOTE_ZYGOTE_LINUX_H_
+#define CONTENT_ZYGOTE_ZYGOTE_LINUX_H_
 
 #include <stddef.h>
 
 #include <string>
 
 #include "base/containers/small_map.h"
 #include "base/files/scoped_file.h"
 #include "base/memory/scoped_vector.h"
 #include "base/posix/global_descriptors.h"
 #include "base/process/kill.h"
@@ skipping 114 matching lines @@
   // exits.
   std::vector<base::ProcessHandle> extra_children_;
 
   // This vector contains the FDs that must be closed before reaping the extra
   // children.
   std::vector<int> extra_fds_;
 };
 
 }  // namespace content
 
-#endif  // CONTENT_ZYGOTE_ZYGOTE_H_
+#endif  // CONTENT_ZYGOTE_ZYGOTE_LINUX_H_