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

ui/base/touch/touch_enabled.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 "ui/base/touch/touch_enabled.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "ui/base/touch/touch_device.h"
 #include "ui/base/ui_base_switches.h"
 #include "ui/events/event_switches.h"
 
 namespace ui {
 
 bool AreTouchEventsEnabled() {
-  const CommandLine& command_line = *CommandLine::ForCurrentProcess();
+  const base::CommandLine& command_line =
+      *base::CommandLine::ForCurrentProcess();
   const std::string touch_enabled_switch =
       command_line.HasSwitch(switches::kTouchEvents) ?
       command_line.GetSwitchValueASCII(switches::kTouchEvents) :
       switches::kTouchEventsAuto;
 
   if (touch_enabled_switch.empty() ||
       touch_enabled_switch == switches::kTouchEventsEnabled)
     return true;
   if (touch_enabled_switch == switches::kTouchEventsAuto)
     return IsTouchDevicePresent();
   if (touch_enabled_switch != switches::kTouchEventsDisabled)
     LOG(ERROR) << "Invalid --touch-events option: " << touch_enabled_switch;
   return false;
 }
 
 }  // namespace ui