Simplify ZygoteForkDelegate API further

components/nacl/zygote/nacl_fork_delegate_linux.h

Index: components/nacl/zygote/nacl_fork_delegate_linux.h
diff --git a/components/nacl/zygote/nacl_fork_delegate_linux.h b/components/nacl/zygote/nacl_fork_delegate_linux.h
index afd5e0213f55d22208cef85e88455faa9cac36e8..3239b058a70fc2e26dba31130b19f3dc58dfe482 100644
--- a/components/nacl/zygote/nacl_fork_delegate_linux.h
+++ b/components/nacl/zygote/nacl_fork_delegate_linux.h
@@ -29,8 +29,8 @@ class NaClForkDelegate : public content::ZygoteForkDelegate {
   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;