Use implicit_cast<> instead of static_cast<> whenever possible

util/test/posix/close_multiple.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/test/posix/close_multiple.h"
 
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
 #include <stdlib.h>
 #include <string.h>
 #include <unistd.h>
 
 #include <algorithm>
 
+#include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/posix/eintr_wrapper.h"
 #include "build/build_config.h"
 #include "util/numeric/safe_assignment.h"
 
 // Everything in this file is expected to execute between fork() and exec(),
 // so everything called here must be acceptable in this context. However,
 // logging code that is not expected to execute under normal circumstances is
 // currently permitted.
@@ skipping 100 matching lines @@
   }
 
   // Fallback: close every file descriptor starting at |fd| and ending at the
   // system’s file descriptor limit. Check a few values and use the highest as
   // the limit, because these may be based on the file descriptor limit set by
   // setrlimit(), and higher-numbered file descriptors may have been opened
   // prior to the limit being lowered. For Mac OS X, see 10.9.2
   // Libc-997.90.3/gen/FreeBSD/sysconf.c sysconf() and 10.9.4
   // xnu-2422.110.17/bsd/kern/kern_descrip.c getdtablesize(), which both return
   // the current RLIMIT_NOFILE value, not the maximum possible file descriptor.
-  int max_fd = std::max(static_cast<int>(sysconf(_SC_OPEN_MAX)), OPEN_MAX);
+  int max_fd = std::max(implicit_cast<int>(sysconf(_SC_OPEN_MAX)), OPEN_MAX);
   max_fd = std::max(max_fd, getdtablesize());
 
   for (int entry_fd = fd; entry_fd < max_fd; ++entry_fd) {
     if (entry_fd != preserve_fd) {
       CloseNowOrOnExec(entry_fd, true);
     }
   }
 }
 
 }  // namespace crashpad