Use implicit_cast<> instead of static_cast<> whenever possible

snapshot/mac/mach_o_image_reader.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 421 matching lines @@
                         section->size) << module_info_;
     return false;
   }
 
   *value = slid_value;
   return true;
 }
 
 uint32_t MachOImageReader::DylibVersion() const {
   INITIALIZATION_STATE_DCHECK_VALID(initialized_);
-  DCHECK_EQ(FileType(), static_cast<uint32_t>(MH_DYLIB));
+  DCHECK_EQ(FileType(), implicit_cast<uint32_t>(MH_DYLIB));
 
   if (id_dylib_command_) {
     return id_dylib_command_->dylib_current_version;
   }
 
   // In case this was a weird dylib without an LC_ID_DYLIB command.
   return 0;
 }
 
 void MachOImageReader::UUID(crashpad::UUID* uuid) const {
@@ skipping 209 matching lines @@
                                  linkedit_segment,
                                  module_info_)) {
     symbol_table_.reset();
     return;
   }
 
   symbol_table_initialized_.set_valid();
 }
 
 }  // namespace crashpad