Include implicit_cast.h at all users of it.

util/mac/launchd.mm

 // 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/mac/launchd.h"
 
 #import <Foundation/Foundation.h>
 
 #include "base/basictypes.h"
 #include "base/mac/foundation_util.h"
 #include "base/mac/scoped_launch_data.h"
 #include "base/mac/scoped_cftyperef.h"
 #include "base/strings/sys_string_conversions.h"
+#include "util/misc/implicit_cast.h"
 
 namespace crashpad {
 
 launch_data_t CFPropertyToLaunchData(CFPropertyListRef property_cf) {
   @autoreleasepool {
     // This function mixes Foundation and Core Foundation access to property
     // list elements according to which is more convenient and correct for any
     // specific task.
 
     launch_data_t data_launch = nullptr;
@@ skipping 98 matching lines @@
           CFCopyTypeIDDescription(type_id_cf));
       DLOG(ERROR) << "unable to convert CFTypeID " << type_id_cf << " ("
                   << base::SysCFStringRefToUTF8(type_name_cf) << ")";
     }
 
     return data_launch;
   }
 }
 
 }  // namespace crashpad