Don’t use using directives (“using namespace”) in tools

tools/catch_exception_tool.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 17 matching lines @@
 #include "base/mac/mach_logging.h"
 #include "tools/tool_support.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_server.h"
 #include "util/mach/symbolic_constants_mach.h"
 #include "util/posix/symbolic_constants_posix.h"
 #include "util/stdlib/string_number_conversion.h"
 
+namespace crashpad {
 namespace {
 
-using namespace crashpad;
-
 struct Options {
   std::string file_path;
   std::string mach_service;
   FILE* file;
   int timeout_secs;
   MachMessageServer::Nonblocking nonblocking;
   MachMessageServer::Persistent persistent;
 };
 
 class ExceptionServer : public UniversalMachExcServer {
@@ skipping 120 matching lines @@
 "  -m, --mach_service=SERVICE  register SERVICE with the bootstrap server\n"
 "  -n, --nonblocking           don't block waiting for an exception to occur\n"
 "  -p, --persistent            continue processing exceptions after the first\n"
 "  -t, --timeout=TIMEOUT       run for a maximum of TIMEOUT seconds\n"
 "      --help                  display this help and exit\n"
 "      --version               output version information and exit\n",
           me.c_str());
   ToolSupport::UsageTail(me);
 }
 
-}  // namespace
-
-int main(int argc, char* argv[]) {
+int CatchExceptionToolMain(int argc, char* argv[]) {
   const std::string me(basename(argv[0]));
 
   enum OptionFlags {
     // “Short” (single-character) options.
     kOptionFile = 'f',
     kOptionMachService = 'm',
     kOptionNonblocking = 'n',
     kOptionPersistent = 'p',
     kOptionTimeout = 't',
 
@@ skipping 98 matching lines @@
     // This is not an error: when exiting on timeout during persistent
     // processing and at least one exception was handled, it’s considered a
     // success.
   } else if (mr != MACH_MSG_SUCCESS) {
     MACH_LOG(ERROR, mr) << "MachMessageServer::Run";
     return EXIT_FAILURE;
   }
 
   return EXIT_SUCCESS;
 }
+
+}  // namespace
+}  // namespace crashpad
+
+int main(int argc, char* argv[]) {
+  return crashpad::CatchExceptionToolMain(argc, argv);
+}