Use task_t, thread_t, and exception_handler_t uniformly

util/test/mac/mach_multiprocess.h

Index: util/test/mac/mach_multiprocess.h
diff --git a/util/test/mac/mach_multiprocess.h b/util/test/mac/mach_multiprocess.h
index b949e652dfcf925c549e3ffac06699f19237bb8a..e709533a7b3c1ac28ff6fa3b1f89274a7b198906 100644
--- a/util/test/mac/mach_multiprocess.h
+++ b/util/test/mac/mach_multiprocess.h
@@ -68,7 +68,7 @@ class MachMultiprocess : public Multiprocess {
   //! \brief Returns a send right for the child’s task port.
   //!
   //! This method may only be called by the parent process.
-  mach_port_t ChildTask() const;
+  task_t ChildTask() const;
 
  private:
   // Multiprocess: