Add ConstThreadState to mach_extensions.h and use it everywhere

snapshot/mac/exception_snapshot_mac.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,
 // 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.
 
 #ifndef CRASHPAD_SNAPSHOT_MAC_EXCEPTION_SNAPSHOT_MAC_H_
 #define CRASHPAD_SNAPSHOT_MAC_EXCEPTION_SNAPSHOT_MAC_H_
 
 #include <mach/mach.h>
 #include <stdint.h>
 
 #include <vector>
 
 #include "base/basictypes.h"
 #include "build/build_config.h"
 #include "snapshot/cpu_context.h"
 #include "snapshot/exception_snapshot.h"
+#include "util/mach/mach_extensions.h"
 #include "util/misc/initialization_state_dcheck.h"
 
 namespace crashpad {
 
 class ProcessReader;
 
 namespace internal {
 
 //! \brief An ExceptionSnapshot of an exception sustained by a running (or
 //!     crashed) process on a Mac OS X system.
@@ skipping 11 matching lines @@
   //!     exception.
   //!
   //! \return `true` if the snapshot could be created, `false` otherwise with
   //!     an appropriate message logged.
   bool Initialize(ProcessReader* process_reader,
                   thread_t exception_thread,
                   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* state,
+                  ConstThreadState state,
                   mach_msg_type_number_t state_count);
 
   // ExceptionSnapshot:
 
   const CPUContext* Context() const override;
   uint64_t ThreadID() const override;
   uint32_t Exception() const override;
   uint32_t ExceptionInfo() const override;
   uint64_t ExceptionAddress() const override;
   const std::vector<uint64_t>& Codes() const override;
@@ skipping 13 matching lines @@
   uint32_t exception_code_0_;
   InitializationStateDcheck initialized_;
 
   DISALLOW_COPY_AND_ASSIGN(ExceptionSnapshotMac);
 };
 
 }  // namespace internal
 }  // namespace crashpad
 
 #endif  // CRASHPAD_SNAPSHOT_MAC_EXCEPTION_SNAPSHOT_MAC_H_