Simplify ZygoteForkDelegate API further

components/nacl/zygote/nacl_fork_delegate_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 COMPONENTS_NACL_ZYGOTE_NACL_FORK_DELEGATE_LINUX_H_
 #define COMPONENTS_NACL_ZYGOTE_NACL_FORK_DELEGATE_LINUX_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 11 matching lines @@
   NaClForkDelegate();
   virtual ~NaClForkDelegate();
 
   virtual void Init(int sandboxdesc) OVERRIDE;
   virtual void InitialUMA(std::string* uma_name,
                           int* uma_sample,
                           int* uma_boundary_value) OVERRIDE;
   virtual bool CanHelp(const std::string& process_type, std::string* uma_name,
                           int* uma_sample, int* uma_boundary_value) OVERRIDE;
   virtual pid_t Fork(const std::string& process_type,
-                     const std::vector<int>& fds) OVERRIDE;
-  virtual bool AckChild(int fd, const std::string& channel_id) OVERRIDE;
+                     const std::vector<int>& fds,
+                     const std::string& channel_id) OVERRIDE;
   virtual bool GetTerminationStatus(pid_t pid, bool known_dead,
                                     base::TerminationStatus* status,
                                     int* exit_code) OVERRIDE;
 
  private:
   // These values are reported via UMA and hence they become permanent
   // constants.  Old values cannot be reused, only new ones added.
   enum NaClHelperStatus {
     kNaClHelperUnused = 0,
     kNaClHelperMissing = 1,
     kNaClHelperBootstrapMissing = 2,
     kNaClHelperValgrind = 3,
     kNaClHelperLaunchFailed = 4,
     kNaClHelperAckFailed = 5,
     kNaClHelperSuccess = 6,
     kNaClHelperStatusBoundary  // Must be one greater than highest value used.
   };
 
   NaClHelperStatus status_;
   int fd_;
 };
 
 #endif  // COMPONENTS_NACL_ZYGOTE_NACL_FORK_DELEGATE_LINUX_H_