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

tools/gn/function_exec_script.cc

 // Copyright (c) 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 "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/time/time.h"
@@ skipping 110 matching lines @@
         return Value();
       g_scheduler->AddGenDependency(
           build_settings->GetFullPath(cur_dir.ResolveRelativeFile(
               dep.string_value(),
               scope->settings()->build_settings()->root_path_utf8())));
     }
   }
 
   // Make the command line.
   const base::FilePath& python_path = build_settings->python_path();
-  CommandLine cmdline(python_path);
+  base::CommandLine cmdline(python_path);
   cmdline.AppendArgPath(script_path);
 
   if (args.size() >= 2) {
     // Optional command-line arguments to the script.
     const Value& script_args = args[1];
     if (!script_args.VerifyTypeIs(Value::LIST, err))
       return Value();
     for (const auto& arg : script_args.list_value()) {
       if (!arg.VerifyTypeIs(Value::STRING, err))
         return Value();
@@ skipping 58 matching lines @@
                msg);
     return Value();
   }
 
   // Default to None value for the input conversion if unspecified.
   return ConvertInputToValue(scope->settings(), output, function,
                              args.size() >= 3 ? args[2] : Value(), err);
 }
 
 }  // namespace functions