Use task_t, thread_t, and exception_handler_t uniformly

util/test/mac/mach_multiprocess.h

 // Copyright 2014 The Crashpad Authors. All rights reserved.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //     http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 50 matching lines @@
   //! \brief Returns a send right for the remote port.
   //!
   //! This method may be called by either the parent or the child process. It
   //! returns a send right, with the corresponding receive right held in the
   //! opposing process.
   mach_port_t RemotePort() const;
 
   //! \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:
 
   //! \brief Runs the parent side of the test.
   //!
   //! This method establishes the parent’s environment and calls
   //! MachMultiprocessParent().
   //!
   //! Subclasses must override MachMultiprocessParent() instead of this method.
@@ skipping 29 matching lines @@
 
   internal::MachMultiprocessInfo* info_;
 
   DISALLOW_COPY_AND_ASSIGN(MachMultiprocess);
 };
 
 }  // namespace test
 }  // namespace crashpad
 
 #endif  // CRASHPAD_UTIL_TEST_MAC_MACH_MULTIPROCESS_H_