Use implicit_cast<> instead of static_cast<> whenever possible

util/mach/mach_extensions.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_UTIL_MACH_MACH_EXTENSIONS_H_
 #define CRASHPAD_UTIL_MACH_MACH_EXTENSIONS_H_
 
 #include <mach/mach.h>
 
 namespace crashpad {
 
 //! \brief `MACH_PORT_NULL` with the correct type for a Mach port,
 //!     `mach_port_t`.
 //!
 //! For situations where implicit conversions between signed and unsigned types
-//! are not performed, use kMachPortNull instead of an explicit `static_cast` of
-//! `MACH_PORT_NULL` to `mach_port_t`. This is useful for logging and testing
+//! are not performed, use kMachPortNull instead of an explicit `implicit_cast`
+//! of `MACH_PORT_NULL` to `mach_port_t`. This is useful for logging and testing
 //! assertions.
 const mach_port_t kMachPortNull = MACH_PORT_NULL;
 
 //! \brief `MACH_EXCEPTION_CODES` with the correct type for a Mach exception
 //!     behavior, `exception_behavior_t`.
 //!
 //! Signedness problems can occur when ORing `MACH_EXCEPTION_CODES` as a signed
 //! integer, because a signed integer overflow results. This constant can be
 //! used instead of `MACH_EXCEPTION_CODES` in such cases.
 const exception_behavior_t kMachExceptionCodes = MACH_EXCEPTION_CODES;
@@ skipping 39 matching lines @@
 //! appropriate for the system at run time.
 //!
 //! \note `EXC_MASK_ALL` does not include the value of `EXC_MASK_CRASH`.
 //!     Consumers that want `EXC_MASK_ALL` along with `EXC_MASK_CRASH` must use
 //!     ExcMaskAll() | `EXC_MASK_CRASH` explicitly.
 exception_mask_t ExcMaskAll();
 
 }  // namespace crashpad
 
 #endif  // CRASHPAD_UTIL_MACH_MACH_EXTENSIONS_H_