Include implicit_cast.h at all users of it.

util/mach/exc_client_variants_test.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 10 matching lines @@
 #include "base/basictypes.h"
 #include "base/strings/stringprintf.h"
 #include "gtest/gtest.h"
 #include "test/mac/mach_errors.h"
 #include "test/mac/mach_multiprocess.h"
 #include "util/mach/exc_server_variants.h"
 #include "util/mach/exception_behaviors.h"
 #include "util/mach/mach_extensions.h"
 #include "util/mach/mach_message.h"
 #include "util/mach/mach_message_server.h"
+#include "util/misc/implicit_cast.h"
 
 namespace crashpad {
 namespace test {
 namespace {
 
 class TestExcClientVariants : public MachMultiprocess,
                               public UniversalMachExcServer::Interface {
  public:
   TestExcClientVariants(exception_behavior_t behavior, bool all_fields)
       : MachMultiprocess(),
@@ skipping 245 matching lines @@
 
       TestExcClientVariants test_exc_client_variants(behavior, true);
       test_exc_client_variants.Run();
     }
   }
 }
 
 }  // namespace
 }  // namespace test
 }  // namespace crashpad