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

components/password_manager/core/common/experiments.cc

 // Copyright 2014 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 "components/password_manager/core/common/experiments.h"
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
 #include "components/password_manager/core/common/password_manager_switches.h"
 
 namespace password_manager {
 
 bool ManageAccountLinkExperimentEnabled() {
   std::string group_name =
       base::FieldTrialList::FindFullName("PasswordLinkInSettings");
 
-  CommandLine* command_line = CommandLine::ForCurrentProcess();
+  base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
   if (command_line->HasSwitch(switches::kDisablePasswordLink))
     return false;
 
   if (command_line->HasSwitch(switches::kEnablePasswordLink))
     return true;
 
   return group_name == "Enabled";
 }
 
 }  // namespace password_manager