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

chrome/browser/first_run/upgrade_util.cc

 // Copyright (c) 2011 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/first_run/upgrade_util.h"
 
 #include "base/command_line.h"
 #include "base/logging.h"
 
 namespace {
 
-CommandLine* command_line;
+base::CommandLine* command_line;
 
 }  // namespace
 
 namespace upgrade_util {
 
-void SetNewCommandLine(CommandLine* new_command_line) {
+void SetNewCommandLine(base::CommandLine* new_command_line) {
   command_line = new_command_line;
 }
 
 void RelaunchChromeBrowserWithNewCommandLineIfNeeded() {
   if (command_line) {
     if (!RelaunchChromeBrowser(*command_line)) {
       DLOG(ERROR) << "Launching a new instance of the browser failed.";
     } else {
       DLOG(WARNING) << "Launched a new instance of the browser.";
     }
     delete command_line;
     command_line = NULL;
   }
 }
 
 }  // namespace upgrade_util