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

chrome/browser/ui/ash/volume_controller_chromeos.cc

 // Copyright (c) 2012 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/ui/ash/volume_controller_chromeos.h"
 
 #include "ash/ash_switches.h"
 #include "ash/audio/sounds.h"
 #include "base/command_line.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/extensions/api/system_private/system_private_api.h"
 #include "chromeos/audio/chromeos_sounds.h"
 #include "chromeos/chromeos_switches.h"
 #include "content/public/browser/user_metrics.h"
 #include "grit/browser_resources.h"
 #include "media/audio/sounds/sounds_manager.h"
 #include "ui/base/resource/resource_bundle.h"
 
 using chromeos::CrasAudioHandler;
 
 namespace {
 
 // Percent by which the volume should be changed when a volume key is pressed.
 const double kStepPercentage = 4.0;
 
 bool VolumeAdjustSoundEnabled() {
-  return !CommandLine::ForCurrentProcess()->HasSwitch(
+  return !base::CommandLine::ForCurrentProcess()->HasSwitch(
       chromeos::switches::kDisableVolumeAdjustSound);
 }
 
 void PlayVolumeAdjustSound() {
   if (VolumeAdjustSoundEnabled())
     ash::PlaySystemSoundIfSpokenFeedback(chromeos::SOUND_VOLUME_ADJUST);
 }
 
 }  // namespace
 
@@ skipping 60 matching lines @@
       audio_handler->GetOutputVolumePercent(),
       audio_handler->IsOutputMuted());
 }
 
 void VolumeController::OnOutputMuteChanged() {
   CrasAudioHandler* audio_handler = CrasAudioHandler::Get();
   extensions::DispatchVolumeChangedEvent(
       audio_handler->GetOutputVolumePercent(),
       audio_handler->IsOutputMuted());
 }