Make callers of CommandLine use it via the base:: namespace.

content/shell/tools/content_shell_crash_service.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <windows.h>
 #include <stdlib.h>
 #include <tchar.h>
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "components/crash/tools/crash_service.h"
 
 int __stdcall wWinMain(HINSTANCE instance, HINSTANCE, wchar_t* cmd_line,
                        int show_mode) {
   // Manages the destruction of singletons.
   base::AtExitManager exit_manager;
 
-  CommandLine::Init(0, NULL);
+  base::CommandLine::Init(0, NULL);
 
   // Logging to stderr.
   logging::LoggingSettings settings;
   settings.logging_dest = logging::LOG_TO_SYSTEM_DEBUG_LOG;
   logging::InitLogging(settings);
   // Logging with pid, tid and timestamp.
   logging::SetLogItems(true, true, true, false);
 
   VLOG(1) << "session start. cmdline is [" << cmd_line << "]";
 
   breakpad::CrashService crash_service;
   if (!crash_service.Initialize(base::FilePath(), base::FilePath()))
     return 1;
 
   VLOG(1) << "ready to process crash requests";
 
   // Enter the message loop.
   int retv = crash_service.ProcessingLoop();
   // Time to exit.
   VLOG(1) << "session end. return code is " << retv;
   return retv;
 }