Clean up Linux zygote creation code

content/public/common/sandboxed_process_launcher_delegate.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_PUBLIC_COMMON_SANDBOXED_PROCESS_LAUNCHER_DELEGATE_H_
 #define CONTENT_PUBLIC_COMMON_SANDBOXED_PROCESS_LAUNCHER_DELEGATE_H_
 
 #include <cstddef>
 
 #include "base/environment.h"
@@ skipping 32 matching lines @@
   // AddPolicyForSandboxedProcess.
   virtual bool DisableDefaultPolicy();
 
   // Called right before spawning the process. Returns false on failure.
   virtual bool PreSpawnTarget(sandbox::TargetPolicy* policy);
 
   // Called right after the process is launched, but before its thread is run.
   virtual void PostSpawnTarget(base::ProcessHandle process) {}
 
 #elif defined(OS_POSIX)
+
 #if !defined(OS_MACOSX) && !defined(OS_ANDROID)
-  // Override this to return true to use the setuid sandbox.
-  virtual ZygoteHandle* GetZygote();
+  // Returns the zygote used to launch the process.
+  // NOTE: For now Chrome always uses the same zygote for performance reasons.
+  // http://crbug.com/569191
+  virtual ZygoteHandle GetZygote();
 #endif  // !defined(OS_MACOSX) && !defined(OS_ANDROID)
 
   // Override this if the process needs a non-empty environment map.
   virtual base::EnvironmentMap GetEnvironment();
 #endif
 
   // Returns the SandboxType to enforce on the process, or SANDBOX_TYPE_INVALID
   // for no sandbox policy.
   virtual SandboxType GetSandboxType();
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_COMMON_SANDBOXED_PROCESS_LAUNCHER_DELEGATE_H_