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

chrome/browser/chrome_browser_field_trials_desktop.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 "chrome/browser/chrome_browser_field_trials_desktop.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
@@ skipping 47 matching lines @@
 void DisableShowProfileSwitcherTrialIfNecessary() {
   // This trial is created by the VariationsService, but it needs to be disabled
   // if multi-profiles isn't enabled.
   base::FieldTrial* trial = base::FieldTrialList::Find("ShowProfileSwitcher");
   if (trial && !profiles::IsMultipleProfilesEnabled())
     trial->Disable();
 }
 
 }  // namespace
 
-void SetupDesktopFieldTrials(const CommandLine& parsed_command_line,
+void SetupDesktopFieldTrials(const base::CommandLine& parsed_command_line,
                              PrefService* local_state) {
   prerender::ConfigurePrerender(parsed_command_line);
   AutoLaunchChromeFieldTrial();
   SetupInfiniteCacheFieldTrial();
   DisableShowProfileSwitcherTrialIfNecessary();
   SetupShowAppLauncherPromoFieldTrial(local_state);
 }
 
 }  // namespace chrome