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

chrome/browser/mac/install_from_dmg.mm

 // 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/mac/install_from_dmg.h"
 
 #import <AppKit/AppKit.h>
 #include <ApplicationServices/ApplicationServices.h>
 #include <CoreFoundation/CoreFoundation.h>
 #include <CoreServices/CoreServices.h>
@@ skipping 347 matching lines @@
 // call EjectAndTrashDiskImage on dmg_bsd_device_name.
 bool LaunchInstalledApp(NSString* installed_path,
                         const std::string& dmg_bsd_device_name) {
   base::FilePath browser_path([installed_path fileSystemRepresentation]);
 
   base::FilePath helper_path = browser_path.Append("Contents/Versions");
   helper_path = helper_path.Append(chrome::kChromeVersion);
   helper_path = helper_path.Append(chrome::kHelperProcessExecutablePath);
 
   std::vector<std::string> args =
-      CommandLine::ForCurrentProcess()->argv();
+      base::CommandLine::ForCurrentProcess()->argv();
   args[0] = browser_path.value();
 
   std::vector<std::string> relauncher_args;
   if (!dmg_bsd_device_name.empty()) {
     std::string dmg_arg(mac_relauncher::kRelauncherDMGDeviceArg);
     dmg_arg.append(dmg_bsd_device_name);
     relauncher_args.push_back(dmg_arg);
   }
 
   return mac_relauncher::RelaunchAppWithHelper(helper_path.value(),
@@ skipping 299 matching lines @@
   const UInt8* trash_path_u8 = reinterpret_cast<const UInt8*>(
       trash_path.value().c_str());
   status = FNNotifyByPath(trash_path_u8,
                           kFNDirectoryModifiedMessage,
                           kNilOptions);
   if (status != noErr) {
     OSSTATUS_LOG(ERROR, status) << "FNNotifyByPath";
     return;
   }
 }