Define magic descriptors in one place.

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_
 
 #include <string>
 #include <vector>
 
@@ skipping 12 matching lines @@
 // which is called from ChromeMain, simply constructs one of these objects and
 // runs it.
 class Zygote {
  public:
   Zygote(int sandbox_flags,
          ZygoteForkDelegate* helper);
   ~Zygote();
 
   bool ProcessRequests();
 
-  static const int kBrowserDescriptor = 3;
-  static const int kMagicSandboxIPCDescriptor = 5;
-
  private:
   struct ZygoteProcessInfo {
     // Pid from inside the Zygote's PID namespace.
     base::ProcessHandle internal_pid;
     // Keeps track of whether or not a process was started from a fork
     // delegate helper.
     bool started_from_helper;
   };
   typedef base::SmallMap< std::map<base::ProcessHandle, ZygoteProcessInfo> >
       ZygoteProcessMap;
@@ skipping 75 matching lines @@
   // These might be set by helper_->InitialUMA. They supply a UMA enumeration
   // sample we should report on the first fork.
   std::string initial_uma_name_;
   int initial_uma_sample_;
   int initial_uma_boundary_value_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_ZYGOTE_ZYGOTE_H_