Use task_t, thread_t, and exception_handler_t uniformly

util/mach/task_memory.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,
@@ skipping 46 matching lines @@
       user_size_(user_size) {
   vm_address_t vm_end = vm_address + vm_size;
   vm_address_t user_address = reinterpret_cast<vm_address_t>(data_);
   vm_address_t user_end = user_address + user_size;
   DCHECK_GE(user_address, vm_address);
   DCHECK_LE(user_address, vm_end);
   DCHECK_GE(user_end, vm_address);
   DCHECK_LE(user_end, vm_end);
 }
 
-TaskMemory::TaskMemory(mach_port_t task) : task_(task) {
+TaskMemory::TaskMemory(task_t task) : task_(task) {
 }
 
 bool TaskMemory::Read(mach_vm_address_t address, size_t size, void* buffer) {
   scoped_ptr<MappedMemory> memory = ReadMapped(address, size);
   if (!memory) {
     return false;
   }
 
   memcpy(buffer, memory->data(), size);
   return true;
@@ skipping 71 matching lines @@
       size -= read_length;
     }
     read_address = mach_vm_trunc_page(read_address + read_length);
   } while ((!has_size || size > 0) && read_address > address);
 
   LOG(WARNING) << base::StringPrintf("unterminated string at 0x%llx", address);
   return false;
 }
 
 }  // namespace crashpad