Include implicit_cast.h at all users of it.

util/mach/mach_message.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/mach_message.h"
 
 #include <AvailabilityMacros.h>
 #include <bsm/libbsm.h>
 
 #include <limits>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "util/misc/clock.h"
+#include "util/misc/implicit_cast.h"
 
 namespace crashpad {
 
 namespace {
 
 const int kNanosecondsPerMillisecond = 1E6;
 
 // TimerRunning() determines whether |deadline| has passed. If |deadline| is
 // kMachMessageDeadlineWaitIndefinitely, |*timeout_options| is set to
 // MACH_MSG_OPTION_NONE, |*remaining_ms| is set to MACH_MSG_TIMEOUT_NONE, and
@@ skipping 208 matching lines @@
                       nullptr,
                       nullptr);
 #else
   pid_t audit_pid = audit_token_to_pid(audit_trailer->msgh_audit);
 #endif
 
   return audit_pid;
 }
 
 }  // namespace crashpad