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

chrome/browser/policy/policy_helpers.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/policy/policy_helpers.h"
 
 #include "net/base/net_errors.h"
 #include "url/gurl.h"
 
 #if defined(OS_CHROMEOS)
 #include "base/command_line.h"
 #include "chromeos/chromeos_switches.h"
 #endif
 
 #if !defined(OS_CHROMEOS) && !defined(OS_IOS)
 #include "components/signin/core/browser/signin_manager.h"
 #include "google_apis/gaia/gaia_urls.h"
 #endif
 
 namespace policy {
 
 bool OverrideBlacklistForURL(const GURL& url, bool* block, int* reason) {
 #if defined(OS_CHROMEOS)
   // On ChromeOS browsing is only allowed once OOBE has completed. Therefore all
   // requests are blocked until this condition is met.
-  if (CommandLine::ForCurrentProcess()->HasSwitch(
+  if (base::CommandLine::ForCurrentProcess()->HasSwitch(
           chromeos::switches::kOobeGuestSession)) {
     if (!url.SchemeIs("chrome") && !url.SchemeIs("chrome-extension")) {
       *reason = net::ERR_BLOCKED_ENROLLMENT_CHECK_PENDING;
       *block = true;
       return true;
     }
   }
   return false;
 #elif defined(OS_IOS)
   return false;
 #else
   static const char kServiceLoginAuth[] = "/ServiceLoginAuth";
 
   *block = false;
   // Whitelist all the signin flow URLs flagged by the SigninManager.
   if (SigninManager::IsWebBasedSigninFlowURL(url))
     return true;
 
   // Additionally whitelist /ServiceLoginAuth.
   if (url.GetOrigin() != GaiaUrls::GetInstance()->gaia_url().GetOrigin())
     return false;
 
   return url.path() == kServiceLoginAuth;
 #endif
 }
 
 }  // namespace policy