Add ConstThreadState to mach_extensions.h and use it everywhere

util/mach/exc_client_variants.cc

 // 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,
 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 // See the License for the specific language governing permissions and
 // limitations under the License.
 
 #include "util/mach/exc_client_variants.h"
 
 #include <vector>
 
 #include "base/logging.h"
 #include "util/mach/exc.h"
 #include "util/mach/mach_exc.h"
-#include "util/mach/mach_extensions.h"
 
 namespace crashpad {
 
 kern_return_t UniversalExceptionRaise(exception_behavior_t behavior,
                                       exception_handler_t exception_port,
                                       thread_t thread,
                                       task_t task,
                                       exception_type_t exception,
                                       const mach_exception_data_type_t* code,
                                       mach_msg_type_number_t code_count,
                                       thread_state_flavor_t* flavor,
-                                      const natural_t* old_state,
+                                      ConstThreadState old_state,
                                       mach_msg_type_number_t old_state_count,
                                       thread_state_t new_state,
                                       mach_msg_type_number_t* new_state_count) {
   // This function is similar to 10.9.4 xnu-2422.110.17/osfmk/kern/exception.c
   // exception_deliver() as far as the delivery logic is concerned. Unlike
   // exception_deliver(), this function does not get or set thread states for
   // behavior values that require this, as that is left to the caller to do if
   // needed.
 
   std::vector<exception_data_type_t> small_code_vector;
@@ skipping 76 matching lines @@
           new_state,
           new_state_count);
 
     default:
       NOTREACHED();
       return KERN_INVALID_ARGUMENT;
   }
 }
 
 }  // namespace crashpad